File Name: mcq on force and laws of motion .zip
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Formulae Handbook for Class 9 Maths and Science. Question 1: What name is given to the product of mass and velocity of a body? Solution : The product of mass and velocity of a body is called momentum. Question 2: Name the physical quantity which is considered to be a measure of the quantity of motion of a body.
Solution : Momentum is the measure of quantity of motion of a body. Question 3: What is the SI unit of momentum? Solution : The SI unit of momentum is kilogram meters per second kg. Question 4: State whether momentum is scalar or vector. Solution : Momentum is a vector quantity and is dirceted along the direction of velocity.
Question 5: What is the total momentum of the bullet and the gun before firing? Solution : The total momentum of the bullet and the gun before firing would be zero because velocities of both of them will be zero. Question 6: Name the physical quantity whose unit is kg. Solution : Momentum has its SI unit as kilogram meters per second kg. Question 8: What is the usual name of the forces which cannot produce motion in a body but only change its shape?
Solution : Balanced forces cannot produce motion in a body but can its shape. Question 9: Name the unbalanced force which slows down a moving bicycle when we stop pedalling it.
Solution : Frictional force slows down a moving bicycle when we stop pedaling it. Question State whether the following statement is true or false : Unbalanced forces acting on a body change its shape. Solution : The given statement is false. Question When a ball is dropped from a height, its speed increases gradually. Name the force which causes this change in speed. Solution : Force of gravity causes this change in speed. Question Name the property of bodies or objects to resist a change in their state of rest or of motion.
Solution : Inertia is the property of bodies to resist a change in their state of rest or motion. Question The mass of object A is 6 kg whereas that of another object B is 34 kg.
Which of the two objects, A or B, has more inertia? Solution : Object B has more inertia. Since mass is a measure of inertia of a body and object B has greater mass, so it will have greater inertia.
Question Name the scientist who gave the laws of motion. Solution : Isaac Newton gave the laws of motion. Question State whether force is a scalar or a vector quantity. Solution : Force is a vector quantity. Question With which physical quantity should the speed of a running bull be multiplied so as to obtain its momentum? Solution : The speed of the running bull should be multiplied with its mass to get its momentum.
Question Fill in the following blanks with suitable words : a ………………is a measure of the inertia of a body. Solution : a Mass b forward c backward d inertia e friction; air. Question Explain why, it is easier to stop a tennis ball than a cricket ball moving with the same speed.
Solution : Since the speed of tennis ball and cricket ball is same, the momentum of cricket ball will be higher due to its mass being greater than mass of tennis ball. So, less force is required to stop a tennis ball than to stop a cricket ball.
Question Explain the meaning of the following equation :. Here, p is momentum of the body m is the mass of the body v is the velocity of the body.
Question Explain how, a karate player can break a pile of tiles with a single blow of his hand. Solution : A karate player can break a pile of tiles with a single blow because he strikes the pile with his hand very fast. In doing so, the large momentum of his hand is reduced to zero in a very short time.
This exerts a large force on the pile of tiles which is sufficient to break them apart. Question A body of mass 25 kg has a momentum of kg. Calculate the velocity of the body. Question Which of the two, balanced forces or unbalanced forces, can change the shape of an object? Give an example to illustrate your answer. Solution : Balanced forces can change the shape of the object. For example, when a balloon is pressed between hands, then balanced forces equal and opposite forces act on the balloon due to which the shape of the balloon changes.
Solution : Inertia of motion is the property of a body due to which it resists a change in its state of uniform motion. For eg. For example, a book lying on a table remains on the table unless we lift it with the force of our hands. And, on a frictionless surface, a moving car continues to be in the state of motion until brakes are applied on it. Question On what factor does the inertia of a body depend? Which has more inertia, a cricket ball or a rubber ball of the same size?
Solution : Inertia of a body depends on its mass. A cricket ball has more inertia than a rubber ball of the same size because it has more mass than the rubber ball. Question Why do the passengers in a bus tend to fall backward when it starts suddenly?
Solution : When a bus starts suddenly, its passengers tend to fall backwards because due to their inertia, the passengers tend to remain in a state of rest even when the bus starts moving. Question Explain why, a person travelling in a bus falls forward when the bus stops suddenly. Solution : When a bus stops suddenly, its passengers tend to fall forward because due to their inertia, the passengers tend to remain in a state of motion even though the bus has come to rest.
Question Give reason for the following : When a hanging carpet is beaten with a stick, the dust particles start coming out of it. Solution : When a hanging carpet is beaten with a stick, the carpet moves to and fro with the force of the stick while the dust particles remain in their state of rest on account of their inertia and thus dust particles separate out from the carpet. Question When a tree is shaken, its fruits and leaves fall down: Why? Solution : When a tree is shaken, the tree moves to and fro while the fruits and leaves remain in their state of rest on account of their inertia and thus fruits and leaves separate from the tree and fall from the tree.
Question Explain why, it is dangerous to jump out of a moving bus. Solution : It is dangerous to jump out of a moving bus because the jumping man, who is moving with the high speed of the bus would tend to remain in state of motion due to inertia even on falling to the ground and get hurt due to resistance offered by the ground.
Question What is the momentum in kg. Question a Define momentum of a body. On what factors does the momentum of a body depend? Solution : a Momentum is the physical quantity which is the measure of the quantity of motion of a moving body. It depends on mass and velocity of the body. Solution : a Force is an influence which tends to set a stationary body in motion or stop a moving body; or which tends to change the speed and direction of a moving body; or which tends to change the shape and size of a body.
Question Give one example each where : a a force moves a stationary body. Solution : a Kicking a stationary football. Explain with examples. What effect is produced in the ball? Solution : a If the resultant of all the forces acting on a body is zero, the forces are called balanced forces. These forces do not change the state of rest or of uniform motion of a body but can change the shape of the body.
If the resultant of all the forces acting on a body is not zero, the forces are called unbalanced forces. These forces change the state of rest or of uniform motion of a body. Question a What happens to the passengers travelling in a bus when the bus takes a sharp turn?
Give reasons for your answer. Solution : a When a bus takes a sharp turn, the passengers tend to fall sideways because of their inertia or their tendency to continue moving in a straight line. Question A plastic ball and a clay ball of equal masses, travelling in the same direction with equal speeds, strike against a vertical wall. From which ball does the wall receive a greater amount of momentum? Solution : The wall will receive equal momentum from both the balls because both balls have equal mass and velocity.
Question A moving bicycle comes to rest after sometime if we stop pedalling it. How do you explain the bicycle case? Solution : In this case, the bicycle has been compelled to change its state of motion by the external force of air resistance and friction. If there were no air resistance and no friction to oppose the motion of the bicycle, then according to the first law of motion, the bicycle would go on moving forever.
Question A car is moving on a level road. A student says that two forces act on the car which bring it to a stop. What could these forces be? Which of these two forces contributes more to slow down and stop the car? Solution : The two forces acting on the car are force of friction and air resistance. Force of friction contributes more to slow down and stop the car.
Rotational Work and Energy, 6. Q1: What was geocentric model? Universal Law of Gravitation The force with which the two objects attract each other is called gravitational force. Register online for Science tuition on Vedantu. Sunday, 26 October Answer: Ptolemy a Greek mathematician and astronomer proposed geocentric model around AD. Chapter
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CBSE Class 9 Science Exam Important MCQs from Chapter 9 Force and Laws of Motion with Answers PDF. Get here CBSE Class 9.
Thus, users will get around very important questions from each chapter in form of CBSE test papers with complete solution and answers. Science Important Questions Class 9 are given below.. Questions : 1. The second law gives us more concrete measurements of the Force and provides us the equation of force. Examples: Examples: i When a moving car suddenly stops the person sitting in the car falls forward because the lower portion of the body in contact with the car comes to rest whereas the upper part tends to remain in motion due to inertia of motion.
Forces and Laws of Motion is a crucial chapter. In this chapter, students learn about the Laws of Motion as given by Sir Issac Newton, the various terminologies used for denoting forces of nature and motion of objects, the relation between objects, force, motion, etc. It gives students valuable knowledge about the working of the universe. Force and Laws of Motion important questions will ensure that students are prepared for all types of questions that might appear in exams. It will help them understand how well they have prepared, how good their time management is, and how they can improve.
Glide to success with Doorsteptutor material for NEET : fully solved questions with step-by-step explanation - practice your way to success. A stone thrown on a windowpane smashes it into pieces, while a bullet fired against it makes a clean hole through it. When an object falls to the earth, the earth also moves up to meet it but earth's motion is not noticeable. Why a person falling on a pucca floor receives more severe injuries than when falling on a heap of sand. A force acts for 10 sec on a body of mass 10g.
Momentum 7. Example — to open a door, either we push or pull it.
The mass of the body b. Zero c. The weight of the body d. The force required to stop it e.
Multiple choice questions and answers on dynamics MCQ questions PDF covers topics: Dynamics and friction, force inertia and momentum, force, inertia and momentum, Newton's laws of motion, friction, types of friction, and uniform circular motion. Multiple choice questions and answers on gravitation MCQ questions PDF covers topics: Gravitational force, artificial satellites, g value and altitude, mass of earth, variation of g with altitude. Multiple choice questions and answers on kinematics MCQ questions PDF covers topics: Analysis of motion, equations of motion, graphical analysis of motion, motion key terms, motion of free falling bodies, motion of freely falling bodies, rest and motion, scalars and vectors, terms associated with motion, types of motion. Multiple choice questions and answers on physical quantities and measurement MCQ questions PDF covers topics: Physical quantities, measuring devices, measuring instruments, basic measurement devices, introduction to physics, basic physics, international system of units, least count, significant digits, prefixes, scientific notation, and significant figures. Multiple choice questions and answers on thermal properties of matter MCQ questions PDF covers topics: Change of thermal properties of matter, thermal expansion, thermal physics, state, equilibrium, evaporation, latent heat of fusion, latent heat of vaporization, specific heat capacity, temperature and heat, temperature conversion, and thermometer. Multiple choice questions and answers on transfer of heat MCQ questions PDF covers topics: Heat, heat transfer and radiation, application and consequences of radiation, conduction, convection, general physics, radiations and applications, and thermal physics.
Formulae Handbook for Class 9 Maths and Science. Question 1: What name is given to the product of mass and velocity of a body? Solution : The product of mass and velocity of a body is called momentum. Question 2: Name the physical quantity which is considered to be a measure of the quantity of motion of a body. Solution : Momentum is the measure of quantity of motion of a body. Question 3: What is the SI unit of momentum? Solution : The SI unit of momentum is kilogram meters per second kg.
In this case, the goalkeeper applied a force to change the velocity of the ball. Download MCQ and Problems on Force & laws of Motion as pdf · Page 1 · Page 2.