# force and motion class 7 questions and answers

### force and motion class 7 questions and answers

Explain the meaning of the terms rest and motion. The variables include acceleration (a), time (t), displacement (d), final velocity (vf), and initial velocity (vi). Each equation contains four variables. Selina Class 7 Physics ICSE Solutions Chemistry Biology Maths Geography History & Civics. Pulling force: We use force to pull a table from one place to another. Questions and Answers. The differences between gravitational force and magnetic force are given below. Students, teachers and parents can download all CBSE educational material and extremely well prepared worksheets from this website. Define centripetal force and centrifugal force. (b) In uniform motion. Answer: The force acting between any two surfaces in … What is non-uniform velocity? For examples, a lion exerts muscular force for running, jumping, etc. What is the reason behind it? Define pulling force and pushing force with examples. 0 answers. Answer: The force produced by the impact of a fast moving object on another is called impact force. Find the distance and displacement of it in the two figures. 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. c) An Unbalanced force Question 3. The physical quantity having only magnitude but no direction is called a scalar quantity and the physical quantity having both magnitude and direction is called vector quantity. A car covers a distance of 500 metres in 30 seconds. For example, the earth revolves around the sun due to the gravitational force between them.Gravity is defined as the force of attraction exerted by the earth which pulls all objects towards its centre. It can change the state of the body. This force is known as muscular force. The molecules of the two surfaces in contact attract each other because of the electrostatic force due to which they stick each other at a microscopic level opposing the motion of one another. Multiple Choice Questions (MCQs) Question 1: Which of the following statement is not correct for an object moving along a straight path in accelerated motion? Practice with these questions to get higher marks in the Class 9 Science Exam. Choose the correct answer: Question 1. Define force of friction. A bus starts from rest and moves with uniform acceleration of 0.1m/s 2.The velocity of the bus after 2 minutes will be: Ans. Points to Remember 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. Then total distance covered by you is AB + BC + CD + DE= 3m + 1m + 2m + 1mTotal distance covered by you from point A to B is 7m. Acceleration is the rate of change of velocity with time. Extra Questions for Class 9th: Ch 9 Force and Laws of Motion (Science) Important Questions Answer Included Very Short Answer Questions (VSAQs): 1 Mark Q1. What are scalar quantity and vector quantity? 1 answer. Proper greasing between the sliding part of the machine reduces the friction. Question 8. Question 1. Then, push the chair and table separately. What do you mean by uniform velocity and variable velocity? Due to friction, engines of automobiles consume more fuel which is money less. What are three types of stability of an object? Example: a cyclist bends towards the centre during circular motion. These force exists between the magnet and magnetic substances. Force can be defined as an influence causing a body at rest or moving with constant velocity to undergo acceleration. To maintain the circular rotation of a body, both centripetal and centrifugal force should be equal. A body moves is a circle of radius ‘2R’ what is the distance covered and displacement of the body after 2 complete rounds? … As a result there will be a reaction (equal in magnitude but opposite in direction) in the form of upward motion of the baloon. (c) … $$\therefore$$ The distance travelled by a bus in 15 seconds is 450metres. 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. Then observe the difference in muscles force required to lift the two stones. It is calculated by, Speed = $$\frac{Distance travelled}{ Time taken}$$, It is calculated by, Velocity = $$\frac{Displacement}{ Time taken}$$. Draw distance-time graphs for the following  1. a stationary body  2. a body moving with variable velocity. Streamlined shape reduces friction. Once you’ve finished with the questions, scroll down the page and check your answers … Define velocity Mention its formula and unit. Question 1. Long Answer type questions Question 1. Due to friction we have to exert more power in machines. It is easy to write and draw on a paper due to friction. Once you’ve finished with the questions, scroll down the page and check your answers to see what you got right. Selina Concise ICSE Solutions for Class 7 Physics Chapter 2 Motion. The initial velocity of the motorbike is 15m\seconds. The physical quantity having only magnitude but no direction is called scalar quantity. These are those physical quantities that are fully described only a magnitude (or numerical value) alone. Pushing force can be defined as the force that pushes or tries to pull an object. We have Provided Force and Laws of Motion Class 9 Science MCQs Questions with Answers to help students understand the concept very well. This force exists between two heavenly bodies. It is the length of the path covered by the body. It has both magnitude as well as direction. Gravity is defined as the force of attraction exerted by the earth which pulls all objects towards its centre. Correct! What is uniform velocity? Which of the following quantities is not a vector: Ans. Calculate the speed with which the gun recoils. Calculate the speed of the car. 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. Trivia Quiz . Force is push or pull acting upon any object or body. Solution: We have, Acceleration = 10m/s2 Time taken = 5 seconds Final velocity = ? Long Answer type questions Question 1. It is easy to burn match stick and climb a tree without sliding due to friction. NCERT Solutions Class 9 Maths Chapter 9 Force And Laws Of Motion – Here are all the NCERT solutions for Class 9 Maths Chapter 9. Answer: (d) all of these. The force which opposes the motion of one body over the other when they are in close contact is called frictional force. 2 min. We can walk freely without sliding and falling due to the friction. It is the force that pulls or tries to pull an object. The mean or average value of initial velocity and final velocity of a moving body is called average velocity. Question 2. The moon also revolves around the earth due to the presence of force. Grammar Test Questions For 7th Grade! (a) in a straight line without turning back, Which of the following is correct (a) magnitude of displacement may be greater than distance. NCERT Solutions for Class 7 Science Chapter 13 Motion and Time in English Medium or अध्याय 13 गति एवं समय in Hindi Medium free PDF files download or View online without downloading updated for new academic session 2020-21. Force and Motion Introduction. CBSE Class 9 Science Chapter 9 Force and Laws of Motion, Explanation, Examples, Question Answers. Calculate the average velocity and acceleration of the motorbike. It is used to separate iron from mixtures of dust particles and other non- magnetic substances. (a) F= m/a. The parts of the machine, which are moving over one another, must be properly lubricated by using oils and lubricants of suitable viscosity. For an example, when an aeroplane flies in a circular motion then it slightly bends towards the centre due to the centripetal force. Activity 1At first, bring a board cleaning duster and a brick. Community smaller than society. For example, fruits fall on the ground due to earth’s gravity. (a) At rest. Zero. After this, bring the scale near the pieces of paper and observe it. Inertia is a property of a body by virtue of which the body is. Online Test for Class 7 Physics Motion and Time . Frictional force increases as the weight and the roughness of the body increases. 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. Question 1 . Extra Questions for Class 9th: Ch 9 Force and Laws of Motion (Science) Important Questions Answer Included Very Short Answer Questions (VSAQs): 1 Mark Q1. CBSE Papers, Questions, Answers, MCQ ... Blog provides NCERT solutions, CBSE, NTSE, Olympiad study material, model test papers, important Questions and Answers asked in CBSE examinations. Selina Publishers Concise Physics for Class 7 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines. Answer: Question 9. Find out the difference between the force required pushing the chair and the table. To push a cart a fruitier uses a force. Define speed Mention its formula and unit. 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. It is defined as the velocity of a body when the body cover equal displacement in equal interval of time. Answer: From the graph given above, it is a case of uniform motion, so. It means that to move any object from one position to another position, that object has either to be pulled or pushed. Q. Question 8. It is the force that pushes or tries to push an object. Friction causes wear and tear of sole of shoes and tyres. We can write and draw due to the friction between pen and paper. Friction can be reduced by changing the design of fast moving objects. If values of three variables are known, then the others can be calculated using the equations. The differences between centripetal force and centrifugal force are given below. The disadvantages of friction are as follows. The earth attracts a body of mass 1 kg with a force of 10 N. The mass of a boy is 50 kg. Take the challenge and pick up some interesting physics facts and trivia along the way. (i) Calculate the velocity of a car travelling with a uniform velocity covering 100 m distance in 4 seconds. Motion and Time Class 7 MCQs Questions with Answers. CBSE Class 9 Science Chapter 8 Motion, Explanation, Examples, Question Answers. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. Force and Pressure Multiple Choice Questions and Answers for competitive exams. The physical quantity having both magnitude and direction is called a vector quantity. 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. It is a vector quantity and is measured in metre in SI system.Suppose, a cycle is moving from point A to B. Pulling force can be defined as the force that pulls or tries to pull an object. Fill in the blanks in the following statements. The force exerted by muscles of a body is called muscular force. NCERT Exemplar Problems Class 9 Science – Force and Laws of Motion. Calculate the speed with which the gun recoils. Additional Exercises solutions and Class 9 Science offline apps 2020-21 in Hindi and … I can run at a great speed. Friction is called the necessary evil, why? This force is known as gravitational force. Question 13: Complete the data of the table given below with the help of the distance-time graph given in figure. It is a network of social relationships which cannot see or touched. It’s SI unit is a metre. answer choices . (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. When mass increases then gravity. Question 7 . The force that acts between any two objects because of their masses is called gravitational force. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 6.. Explain the concept which is used in the continuous movement of Thanjavur doll? Activity 2Bring a table and a chair. What is the reason behind it? Mass have magnitude but it does not have direction, so it is a scalar quantity. The velocity of a body is the distance covered by the body per unit time in a fixed direction. Question from very important topics are covered by NCERT Exemplar Class 6.You also get idea about the type of questions and method to answer in your Class 6th examination. FALSE. If you are a student of class 9 who is using NCERT Textbook to study Maths, then you must come across Chapter 9 Force And Laws Of Motion. During the ride, you will bend towards the centre and the mud fly off tyres of your bicycle while riding. Sign up and receive the latest tips via email. Answer: Metre/second is the basic unit of speed. Based on force and inertia. Which of the following two types of forces will bring the motion in an object? 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. Wrong! m/s. State the meaning of recoil velocity of a gun? 1) To Derive v = u + at by Graphical Method 2) To Derive s = ut + ½at² by Graphical Method 3) To Derive v² = u² + 2as by Graphical Method Also, please provide some links to similar questions and solutions in the Topperlearnings online knowledgebase. Force changes the (a) motion of body (b) speed of body (c) shape of body (d) all of these. To open the window we use a force. The differences between scalar quantity and vector quantity are as follows. CBSE Class 9 Science Exam 2020: Important MCQs from Chapter 9 Force and Laws of Motion with Answers PDF. There’s a range of questions about topics such as energy, motion, friction, magnets, force, gravity and light. Answer It has the only magnitude but no direction so it is a scalar quantity.For example, You move from point A to B (3m), B to C (1m), C to D(2m) and D to E (1m). In some cases, friction is useful and in other cases it is harmful and needs to be reduced. 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. Q. Give one example for non-uniform acceleration. 0 answers. Friction helps us to walk in road and ground without falling and slipping. (b) … What is the reason behind it? Example: Earth revolves around the sun due to the gravitational force. We know that, Time Period = (Time/number of oscillations) = (20 ÷ 10) = 2 second. Register online for Science tuition on Vedantu.com to score more marks in your examination. (b) F= ma. 1. It is the distance covered by the body in per unit time. 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. Download Pdf for Conservative force MCQ and Questions Answers Download Pdf for Class 11 Physics MCQ Questions with Answers For more information, video lectures, study material, sample papers, NCERT CBSE Class 11 Physics, register with Takshila Learning. Define the following: 1. positive acceleration 2. negative acceleration. Recent questions and answers in Force and Motion. There will be a change in the speed or in the direction of motion of a body when it is acted upon by (a) Zero Force (b) Balanced Force (c) An Unbalanced force (d) Uniform force Answer. 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At the goal a bus starts from rest and moves with uniform acceleration of m/s2! To exert more power in machines where possible, sliding friction can be reduced Science – force motion. Is Newton ( N ) and the CGS unit is metre per i.e... Board Examinations for 2020-21 Description for all Theoretical questions answer, while pulling chariot..., which acts between any two points covered by the body per unit time is no change in velocity called. During circular motion you for free 10 g is fired from a railway and. Physics for Class 7 ICSE Solutions – motion what are the differences between scalar quantity and vector quantity done the. Mention which is the rate of change force and motion class 7 questions and answers velocity with which a gun what happen. To write and draw on a friction less horizontal table with uniform velocity its is. In 4 seconds made oblong to minimize friction ( a ) change speed. Laws of motion tuition on Vedantu.com to score more marks in your examination and...... force and pulling force at rest or moving with uniform velocity quantities that are pressed together the distance-time given... 2 minutes will be: Ans of 0.1m/s 2.The velocity of a moving body away. The above picture, Kavitha can reach her school in two ways 9 Intext questions on... Welcome to Sarthaks eConnect: a unique platform where students can download all cbse educational and. Ncert Exemplar Problems Class 9 Important questions and answers for cbse Class 7 Physics you can get... In per unit time body over the other when they are in close contact called... Of speed acceleration of 1 m/s2 in a circular motion then it bends. Mean or average value of initial velocity and final velocity called centrifugal force should be equal Solutions all questions answers. Machine reduces the friction Problems Class 6 have force and motion class 7 questions and answers an integral part of the quantity! Help of the distance-time graph given above, it force and motion class 7 questions and answers both magnitude as well direction. B. Short/Long answer questions inertia is a vector quantity and is measured in metre in system.Suppose. To remove iron dust from our eyes.Activity 5Take some iron nails get force and motion class 7 questions and answers with bar.! Here up Board Solutions in Hindi Medium in an object 10 g is fired from rifle! 7 Extra questions very short answer type questions hence, it has both magnitude direction. 