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</body></html>";s:4:"text";s:38038:"Recent questions and answers in Force and Motion 0 votes. Answer: Metre/second is the basic unit of speed. Give three examples of each. The initial velocity of the motorbike is 15m\seconds. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 6.. Selina Class 7 Physics ICSE Solutions Chemistry Biology Maths Geography History & Civics. To maintain the circular rotation of a body, both centripetal and centrifugal force should be equal. Solution: We have, Acceleration = 10m/s2 Time taken = 5 seconds Final velocity = ? common interests and common objectives are not necessary for society. 2. Magnetic force:It is the force of attraction exerted by the magnets. Once you’ve finished with the questions, scroll down the page and check your answers … Force is push or pull acting upon any object or body. The force that acts between any two objects because of their masses is called gravitational force. Preview this quiz on Quizizz. Q. Some of the worksheets below are Force and Motion Worksheets in PDF, Lessons on Force and Motion, Balanced and Unbalanced Forces and Velocity and Acceleration with colorful diagrams. The speed of a body is the distance covered by the body per unit time. These NCERT solutions will give you clarity regarding various aspects of this chapter, which will consequently help you to solve questions from this chapter easily. Ex.4 A bullet of mass 10 g is fired from a rifle. It covers 5m in every second. Pulling force can be defined as the force that pulls or tries to pull an object. Friction helps us to walk in road and ground without falling and slipping. Class 8 Science NCERT Solutions for Force and Pressure. By using formula, Average velocity = \(\frac{Initial\; velocity + Final\; velocity}{2}\) = \(\frac{u + v}{2}\) = \(\frac{15 + 25}{2}\) = 20m/s Now, Acceleration = \(\frac{Final\; velocity – Initial\; velocity}{Time \;taken}\) = \(\frac{v – u}{t}\) = \(\frac{25 – 15}{5}\) = 2m/s \(\therefore\) The average velocity is 20m/s and acceleration is 2 m/s2. It’s SI unit is metre per second square. Such force is known as frictional force. Recent questions and answers in Force and Motion 0 votes. Explain the meaning of the terms rest and motion. The main disadvantage of friction is that it produces heat in various parts of machine. It is the force that acts away from the centre during circular motion. Calculate the average velocity and acceleration of the motorbike. It is calculated by the given formula:Velocity = \(\frac{Displacement (s)}{ Time taken (t)}\). Due to friction, noise is also produced in machine. NCERT Exemplar Class 6 Science is very important resource for students preparing for VI Board Examination. The force exerted by muscles of a body is called muscular force. After this, bring the scale near the pieces of paper and observe it. Selina Class 7 Physics ICSE Solutions Chemistry Biology Maths Geography History & Civics. Once you’ve finished with the questions, scroll down the page and check your answers to see what you got right. It opposes the motion of a body moving on the surface of another body. Based on force and inertia. This force is known as gravitational force. An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a friction less horizontal table. 2 second. So, it is moving with uniform velocity. A bus travels 54 km in 90 minutes. It holds the earth in its orbit around the sun. Download 9th Science chapter 9 Intext questions given on Page 118, Page 126, Exercises or Additional Exercises in English Medium. Play this game to review Laws of Motion. (a) in a straight line without turning back, Which of the following is correct (a) magnitude of displacement may be greater than distance. Give one example for uniform acceleration. It is also a vector quantity and measured in metre in SI system.Suppose, a cycle is moving from point A to B. … A body is moving with uniform velocity its acceleration is: Ans. Define pulling force and pushing force with examples. To push a cart a fruitier uses a force. 2 hour. Define 1 newton force. For example, fruits fall on the ground due to earth’s gravity. Mass, length, time, distance, area, volume, etc are some examples of a scalar quantity. Mention which is the most common thing in almost all the clocks. What is non-uniform velocity? (a) Unable to change by itself the state … The force required to lift the small stones is less then the force required to lift the large stone. Question 14: The average age of children of class VII is 12 years and 3 months. By using formula, Speed = \(\frac{ distance travelled}{ Time taken}\) = \(\frac{500}{30}\) = 16.67m/s \(\therefore\) The speed of the car is 16.67m/s. Answer The velocity with which a gun moves backward after firing a bullet is called the recoil velocity of a gun. Question 1. The SI unit of force is Newton (N) and the CGS unit is dyne. Gravitational force acts between sun and earth because of their masses. Streamlined shape reduces friction. The paper gets attached to the scale. (a) Change in speed (b) Change in direction (c) Change in both speed and direction. (b) F= ma. The speed of a body is defined as the distance covered by the body per unit time. (b) … What do you observe? It is the length of the path covered by the body. Selina Concise Physics Class 7 ICSE Solutions – Motion. Gravitational force:A special type of force in the universe or planets of the solar system which causes the planets to revolve around the sun in its own orbits. Answer: Draw centre of gravity of the following regular shaped objects. The differences between centripetal force and centrifugal force are given below. The SI unit of force is Newton. Preview this quiz on Quizizz. The force that acts away from the centre during circular motion is called centrifugal force. Mention its formula and unit. When mass increases then gravity. Calculate the distance covered by the bus in 15 seconds. Frictional force: When two body surfaces are slide just opposite to each other, a special type of force acts upon it or in-between them which opposes the motion of the body. Which of the following quantities is not a vector: Ans. When two body surfaces are slide just opposite to each other, a special type of force acts upon it or in-between them which opposes the motion of the body. Centripetal force and Centrifugal force:When a body moves in a circular path, it experiences two types of force on it, the force that acts towards the centre is called centripetal force while the force that acts away from the centre is called centrifugal force. Proper greasing between the sliding part of the machine reduces the friction. His weight will be 50 kg 500 N 50 N 5 N; B. Short/Long Answer Questions. (a) magnitude of displacement, Distance travelled by a body in a given time (a) is always positive (b) can be zero or positive (c) is always negative. What is uniform velocity? 0 answers. Selina Concise ICSE Solutions for Class 7 Physics Chapter 2 Motion. Answer: Force. TopperLearning’s NCERT Solutions for CBSE Class 9 Physics Chapter 9 Force and Laws of Motion are one of the best study materials for revision. SURVEY . Write its SI unit. with these valuable textbook solutions. Answer: (d) all of these. Force has magnitude as well as the direction of where it is applied, so it is a vector quantity. Define force of friction. (c) F= a/m. Find the distance and displacement of it in the two figures. The moon also revolves around the earth due to the presence of force. Community smaller than society. Due to friction we have to exert more power in machines. TRUE. Long Answer type questions Question 1. The parts of the machine, which are moving over one another, must be properly lubricated by using oils and lubricants of suitable viscosity. What do you observe? Trivia Quiz: General Knowledge For 7 Year Kids! The force exerted by an electrically charged object is called electrostatic force. Draw distance-time graphs for the following 1. a stationary body 2. a body moving with variable velocity. Since, velocity has both magnitude and direction so it is a vector quantity. Can you tell, by choosing which path she could reach the school early. The differences between speed and velocity are as follows. Explain the concept which is used in the continuous movement of Thanjavur doll? NCERT Solutions for Class 9 Science Chapter 9 force and laws of motion updated for 2020-21. In some cases, friction is useful and in other cases it is harmful and needs to be reduced. We have Provided Force and Laws of Motion Class 9 Science MCQs Questions with Answers to help students understand the concept very well. Uma and Priya are friends studying in the same school. (a) At rest. Solution: We have, Velocity = 30m/s Now, the distance covered by bus in 15 seconds is By formula, Velocity = \(\frac{Displacement}{ Time taken}\) Or, V = \(\frac{d}{15}\) Or, 30 = \(\frac{d}{15}\) Or, 30 \(\times\) 15 = d Or, d = 450m. What are scalar quantity and vector quantity? Example: horse pulling cart and lifting water from well. Q. The speed of fast moving object is calculated in terms of km/secFor example : If the motorbike travels distance of 200km in 2hour then the speed of motorbike isSolution;We have, Distance covered: 200km ( 200 \(\times\) 1000)m = 200000m)Time taken: 2 hour (2\(\times 60 \times 60\) seconds = 7200 secondsSpeed: ?By using speed formula,Speed = \(\frac {Distance \;travelled (s)}{ Time \;taken (t)}\)= \(\frac{200km}{2\; hour}\)= 100km/hourHence the speed of motorbike is 100km/hourIn meter per second,Speed = \(\frac{s}{t}\)= \(\frac{200000m}{7200s}\)= 27.78m/sec, It is the displacement per unit time. answered 2 minutes ago in Force and Motion by Zabya (25.8k points) The SI unit of speed is _______, If the velocity of a body does not a changes , then its acceleration is ________ (a) Infinity (b) unity (c) Zero (d) between zero and unity. (a) have a net force acting on it (b) have zero net force acting on it (c) not have any force of gravity on it (d) stop after some time due to gravity Q2: When a bus starts suddenly from rest, the passengers sitting inside the bus move backwards. What do you mean by uniform velocity and variable velocity? In the machine where possible, sliding friction can be replaced by rolling friction by using ball bearings. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. NCERT Exemplar Problems Class 9 Science – Force and Laws of Motion. IDefine acceleration. Mass . What are the differences between distance and displacement? State the meaning of recoil velocity of a gun? It is a vector quantity and is measured in metre in SI system.Suppose, a cycle is moving from point A to B. What do you conclude from this activity? Due to the friction, the sole of our shoes and tyres tears away. If you are a student of class 9 who is using NCERT Textbook to study Science, then you must come across Chapter 9 Force and Laws of Motion. … A body is said to be in uniform velocity if it covers the equal distance in equal interval of time in a fixed direction. It’s SI unit is metre per seconds. ... 15 Questions Show answers. This force is known as pulling force. Give one example for non-uniform acceleration. Question 1 . Take up the quiz below and get to find out just how much you know from our previous classes. CBSE Class 9 Science Exam 2020: Important MCQs from Chapter 9 Force and Laws of Motion with Answers PDF. Answer: 1 newton is the magnitude of force which produces an acceleration of 1 m/s2 in a body of mass 1 kg. Such force is known as frictional force. Take the challenge and pick up some interesting physics facts and trivia along the way. Once you find your worksheet(s), you can either click on the pop-out icon or download button to print or download your desired worksheet(s). The variables include acceleration (a), time (t), displacement (d), final velocity (vf), and initial velocity (vi). Force is a vector quantity. There can be more than one community in a society. This solution contains questions, answers, images, explanations of the complete Chapter 9 titled The Fun They Had of Maths taught in class 9. If we want to shift our table or anything from one place to another place then, we either push or pull the table to maintain in that place. A body is said to be in uniform velocity if it covers the equal distance in equal interval of time in a fixed direction. Activity 1At first, bring a board cleaning duster and a brick. Trivia Quiz . A force 100 makes an angle of 30 deg with the horizontal.The vertical … Friction can be reduced by changing the design of fast moving objects. It has both magnitude and direction. It is also a vector quantity and measured in metre in SI system. Watch Force and Laws of Motion Class 9 NCERT Exercise Solutions (Q1 To Q6). Find out the difference between the force required to pull duster and the brick.The magnitude of the force shown by the spring balance is the force required to pull duster and brick. For example: horse pulling a cart, pulling door to close it.Pushing force can be defined as the force that pushes or tries to push an object. Example: a cyclist bends towards the centre during circular motion. Answer: Question 15: It is described completely by its magnitude. Question 1. Then the velocity of car is given by,Solution:We have,Distance covered: 50km = 50\(\times\) 1000 m = 50,000mTime taken: 55 minutes = 55\(\times\) 60 seconds = 3300 secondsVelocity = ?By using formula,Velocity = \(\frac{Displacement (s)}{ Time taken (t)}\)= \(\frac{s}{t}\)=\(\frac{50,000m}{3300sec}\)= 15.15m/sec\(\therefore\) the velocity of motorbike is 15.15m/sec. Motion and Time Class 7 Extra Questions Science Chapter 13 Motion and Time Class 7 Science Extra Questions Very Short Answer Type Questions. What is the reason behind it? ... CBSE Class 7 - Science - CH13: Motion and Time (MCQs) Motion and Time. It is easy to write and draw on a paper due to friction. It includes every relationship which established among the people. Due to the friction, noise is also produced in the machine. After you have studied lesson, you must be looking for answers of its questions. with these valuable textbook solutions. (a) Define momentum. Pulling force: We use force to pull a table from one place to another. (b) In uniform motion. Nautical mile 2. knot. Then, push the chair and table separately. The nails get attached with the bar magnet. (b) A bullet of mass 0.02 kg is fired from a gun weighing 7.5 kg if the initial velocity of bullet is 200 m/s. The disadvantages of friction are as follows. Selina Concise ICSE Solutions for Class 7 Physics Chapter 3 Energy. Question 9. Can you please provide at least 2 questions each along with solutions of Graphical derivation of the following equations of motion. Force required in accelerating a 3 kg mass at 5 m/s 2 and a 4 kg mass at 4 m/s 2, will be Then pull the duster by using spring balance and note down the reading shown by the spring balance. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. Mass have magnitude but it does not have direction, so it is a scalar quantity. State the meaning of recoil velocity of a gun? VERY SHORT ANSWER QUESTIONS. This shortest distance is the displacement which is in fixed direction. 1 hour. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. The force which opposes the motion of one body over the other when they are in close contact is called frictional force. Force and Laws of Motion Class 9 Important Questions and Answers Science Chapter 9. If a force is balanced, no movement occurs. 30 seconds . It gains a velocity of 25m/seconds in 5 seconds. The shortest distance covered by a moving body in a fixed direction is called displacement. It is the force that pushes or tries to push an object. What is the reason behind it? It is calculated by, Speed = \(\frac{Distance travelled}{ Time taken}\), It is calculated by, Velocity = \(\frac{Displacement}{ Time taken}\). This illustrates an example of (a) Newton First Law of Motion (b) Newton Second Law of Motion When a body moves in a circular path, it experiences two types of force on it, the force that acts towards the centre is called centripetal force while the force that acts away from the centre is called centrifugal force. For an example, when an aeroplane flies in a circular motion then it slightly bends towards the centre due to the centripetal force. Force changes the (a) motion of body (b) speed of body (c) shape of body (d) all of these. Calculate the speed of the car. \(\therefore\) The distance travelled by a bus in 15 seconds is 450metres. By formula, we have Acceleration (a) = \(\frac{Final\; velocity – Initial\; velocity}{time\; taken}\) Or, 10 = \(\frac{v – u }{t}\) Or, 10 = \(\frac{v – o}{5}\) Or, 10 = \(\frac{v}{5}\) Or, 10 \(\times\) 5 = v Or, v = 50m/s. Pulling force can be defined as the force that pulls or tries to pull an object. Fill in the blanks in the following statements. Vehicles move on roads without skidding due to the friction. It is described completely by its magnitude as well as direction. 2 min. \(\therefore\) The final velocity of the bus is 10m/s. Scoring marks in Physics can be easier if you understand the questions and answers clearly. For examples: kicking football and throwing stone. These are those physical quantities that are fully described only a magnitude (or numerical value) alone. What are three types of stability of an object? Example: throwing stone and kicking football. Question 1: A pendulum takes 20 second to complete 10 oscillations, its time period is . For examples: displacement, velocity, and acceleration. It is used to separate iron from mixtures of dust particles and other non- magnetic substances. It is the shortest distance between the initial position and final position. Friction can be reduced by changing the design of the fast moving objects. There’s a range of questions about topics such as energy, motion, friction, magnets, force, gravity and light. You can effectively grasp concepts like mass, inertia, accelerations etc. Worksheets are very critical for every student to practice his/ her concepts. CBSE Class 7 Science Motion and Time Worksheets with Answers for Chapter 13 in PDF format to download prepared by expert Science teachers from latest edition of CBSE(NCERT) books. In this way, some useful energy is lost as heat. Take the challenge and pick up some interesting physics facts and trivia along the way. A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km/h in 10 minutes. A body moves is a circle of radius ‘2R’ what is the distance covered and displacement of the body after 2 complete rounds? An example of unbalanced forces in action is: A a boat floating on still water B a person sitting on a chair C a rising balloon: 6. Q. NCERT Solutions Class 9 Maths Chapter 9 Force And Laws Of Motion – Here are all the NCERT solutions for Class 9 Maths Chapter 9. The earth revolves around the sun due to the gravitational force. It is also used to remove iron dust from our eyes.Activity 5Take some iron nails and a bar magnet. Find its acceleration? It can also be defined as the pull or push which changes or tends to change the position (either rest or motion) of a body. These short solved questions or quizzes are provided by Gkseries. A bus starts from rest. The physical quantity having only magnitude but no direction is called scalar quantity. SURVEY . Short Answer Type Questions. It is the space or the path between any two points covered by the body. It has both magnitude as well as direction. Additional Exercises solutions and Class 9 Science offline apps 2020-21 in Hindi and … The change in velocity is described in terms of acceleration. The earth attracts a body of mass 1 kg with a force of 10 N. The mass of a boy is 50 kg. For examples when we bring the things like iron, cobalt, nickel etc near the magnets then they are pulled towards the magnet due to the magnetic force. By studying these Selina ICSE Solutions for Class 7 Physics you can easily get good marks in ICSE Class 7 Board Examinations. Define gravitational force and gravity with examples. answer choices . Q1: An object moving at constant velocity in an inertial frame must: (a) have a net force acting on it. Nails and the screw hold things together due to friction. Trivia Quiz: General Knowledge For 7 Year Kids! Along with answers to the textbook questions, these solutions have exemplary problems, worksheets, important question and HOTS.. Long Answer type questions Question 1. SURVEY . Force and Pressure Multiple Choice Questions and Answers for competitive exams. Q. For examples: mass, length, and time.The physical quantity having both magnitude and direction is called vector quantity. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. These force exists between the magnet and magnetic substances. Extramarks provides ICSE Class 7 Physics syllabus, sample question papers, online study material for class 7 on each topic to score high in exams. It is calculated by:Average velocity= \(\frac{Initial\;velocity (u) + final\; velocity (v)}{ 2 }\)= \(\frac{u +v}{2}\)Suppose if the initial velocity of the moving car is 30km/hour and final velocity is 40km/hour. When the velocity of the object is increasing by 20 m/s the acceleration is 20 m/s^2 When the velocity of the object is decreasing by 20 m/s. Acceleration is zero when a body moves with uniform velocity as there is no change in velocity. Download NCERT Solutions Offline and Online Apps 2020-21 and NCERT Solutions for other subjects for current academic session 2020–2021. Find out the difference between the force required pushing the chair and the table. You can effectively grasp concepts like mass, inertia, accelerations etc. Force and Motion Introduction. Proper greasing between the sliding parts of machine reduces the friction. Match the following : a. This pushing and pulling of a body is known as force. Time taken = 20 second. As shown in the above picture, Kavitha can reach her school in two ways. We can write and draw due to the friction between pen and paper. This force exists between two heavenly bodies. Then its average velocity is given by:Solution:We have,Average velocity= \(\frac{Initial\; velocity (u) + final\; velocity (v)}{ 2 }\)= \(\frac{u +v}{2}\)= \(\frac{30 + 40}{2}\)=\(\frac{70}{2}\)= 35km/hour\(\therefore\) The average velocity of the car is 30km/hour. Give an example for retardation or declaration. Acceleration is the rate of change of velocity with time. This force is known as muscular force. 12 ms-1. Pushing force. The bullet takes 0.003 s to move through its barrel … Students, teachers and parents can download all CBSE educational material and extremely well prepared worksheets from this website. Question 1 . This type of force is when one object pushes or pulls on another object by touching it Due to friction, engines of automobiles consume more fuel which is money less. m/s. The physical quantity having only magnitude but no direction is called a scalar quantity. What does the strength of gravity between two objects depend upon? So, it is moving with variable velocity. Then, rub your scale on your hair for some time. Grammar Test Questions For 7th Grade! Similarly, while pulling Machhindranath chariot in Newari festival in Nepal, a force is used. The physical quantity having the only magnitude but no direction is called a scalar quantity and the physical quantity having both magnitude and direction is called vector quantity. Question 1. NCERT Solutions for Class 9 Science Chapter 9 force and laws of motion all Intext questions given with in the chapter and end exercise given at the end of the chapters are given below. Question 7 . Pushing force can be defined as the force that pushes or tries to push an object. 1 answer. Answer: The force produced by the impact of a fast moving object on another is called impact force. We pull rope towards us while playing tug of war. It is the force that pulls or tries to pull an object. You can find us in almost every social media platforms. The velocity of a body is the distance covered by the body per unit time in a fixed direction. What are the methods of reducing friction? Give the basic unit of speed. Inertia is a property of a body by virtue of which the body is. I can run at a great speed. The muscles of the human beings and animals exert pulling and pushing force. Correct! A bus moving with a constant speed. It’s SI unit is a metre. The physical quantity having both magnitude and direction is called a vector quantity. Worksheets have become an integral part of the education system. Q.1 Define the force . When there is more centripetal force then centrifugal force, a moving body bends towards the centre. FORCE AND LAWS OF MOTION. Friction is called the necessary evil, why? Once you find your worksheet(s), you can either click on the pop-out icon or download button to print or download your desired worksheet(s). According to Newton's first law of motion, external force is required to change the state of the body. Check the below NCERT MCQ Questions for Class 9 Science Chapter 9 Force and Laws of Motion with Answers Pdf free download. This solution contains questions, answers, images, step by step explanations of the complete Chapter 9 titled Force and Laws of Motion of Science taught in class 9. Mention the real life applications of centre of gravity. Question 8. This force is called friction or force of friction. It is calculated by:Speed =\(\frac{Distance\; travelled (s)}{ Time\; taken (t)}\), Fast moving objects covered a large area in less time then slow moving objects. contact. A bus is moving with the velocity of 30m/s. … What are the uses of graphical study of motion? Therefore, friction is a necessary evil. It has both magnitude and direction. Physics questions and answers for class 9 cbse icse . After some time, the eraser returns to the ground. What are the differences between pushing force and pulling force? A body is said to be moving in variable velocity if it covers the unequal distance in equal interval of time in a fixed direction. (i) Calculate the velocity of a car travelling with a uniform velocity covering 100 m distance in 4 seconds. Pushing force:We use force to push our vehicles if it stops working. Explain the types of stability with suitable examples. Motion and Time Class 7 MCQs Questions with Answers. The physical quantity having both magnitude and direction is called vector quantity. Friction reduces the efficiency of machines. What are the differences between speed and velocity? A car covers a distance of 500 metres in 30 seconds. Q. Bus travelling with increasing acceleration (non – uniform acceleration) Time (s) 0, 1, 2, 3, 4, 5, Speed (ms^-1) 0, 2, 8, 18, 32, 50, Bus travelling at uniform deceleration Time (s) 0, 1, 2, 3, 4, 5 Speed (ms^-1) 50, 40, 30 20, 10, 0, Bus travelling at uniform acceleration Time (s) 0, 1, 2, 3, 4, 5 Speed (ms^-)1 0,18, 32, 42, 50, Bus travelling at uniform speed of m/s Time (s) 0, 1, 2, 3, 4, 5 Speed (ms^-1) 10, 10, 10, 10 ,10, Draw velocity-time graph for the following data: Time (s) 0, 1, 2, 3, 4, 5 Speed (ms^-1) 0, 0, 0, 0, 0, Write the differences between distance and displacement. CBSE Class 9 Science Chapter 9 Force and Laws of Motion, Explanation, Examples, Question Answers. It means that to move any object from one position to another position, that object has either to be pulled or pushed. If it gains an acceleration of 10m/s2 in 5 seconds, calculate the final velocity. This solution contains questions, answers, images, explanations of the complete Chapter 9 titled The Fun They Had of Maths taught in class 9. What would happen to the ball if a greater force was applied on the ball along its direction of motion? Some of the worksheets below are Force and Motion Worksheets in PDF, Lessons on Force and Motion, Balanced and Unbalanced Forces and Velocity and Acceleration with colorful diagrams. What is the reason behind it? We exert muscular force for kicking ball and lifting water.Activity 7Lift two stones of different sizes in your both hand. The surface of another body studied lesson, you must be looking answers. ( 20 ÷ 10 ) = ( 20 ÷ 10 ) = 2 second to...: mass, length, time, the eraser returns to the friction between pen and.. Is a case of uniform motion c. the velocity - time graph is a vector quantity one example the. Stones is less then the velocity of 4 m/s on a paper due to the force! 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