Multiple Choice Questions

FORCE AND LAWS OF MOTION

Updated for CBSE 2027
120+ Practice Questions
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Practice Questions with Answers

Total 120 questions available

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Q. 1
An object of mass 20 kg is moving with a velocity of 10 m/s. Its momentum will be:
A
200 kg·m/s
B
2000 kg·m/s
C
20 kg·m/s
D
2 kg·m/s
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Q. 2
What does the term "inertia" refer to?
A
The mass of an object
B
The speed of an object
C
The force acting on an object
D
The resistance to change in motion
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Q. 3
Which one is correct if a bullet is fired from a rifle?
A
There is no motion of bullet and rifle.
B
Rifle moves in the backward direction and bullet moves in the forward direction.
C
Bullet and rifle both move in backward direction.
D
Bullet moves in backward direction and rifle moves in forward direction.
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Q. 4
Which among the following is true as per Newton’s third law:
A
Action and reaction forces are always unequal.
B
Action and reaction forces are always equal and opposite.
C
Action and reaction forces are always perpendicular.
D
Action and reaction forces act in the same direction.
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Q. 5
What prevents a box from moving when children push it with a small force on a rough surface?
A
Balanced forces
B
Friction force
C
Gravity
D
Inertia
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Q. 6
Which one of the following statements is not correct for an object moving along a straight path in an accelerated motion?
A
A force is always acting on it.
B
It always goes away from earth.
C
Its velocity always changes.
D
Its speed keeps changing.
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Q. 7
What occurs when unbalanced forces act on an object?
A
It spins
B
It maintains its speed
C
It stops moving
D
It changes speed or direction
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Q. 8
Force is defined as:
A
The quantity that opposes inertia.
B
Change in momentum.
C
Rate of change of momentum.
D
The quantity that keeps the velocity constant.
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Q. 9
If the force acting on the body is zero, its momentum is:
A
Zero
B
Constant
C
Infinite
D
None of the above
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Q. 10
The magnitude of a physical quantity is 8.5 Ns. The physical quantity is:
A
Moment of force
B
Momentum
C
Pressure
D
Force
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Q. 11
The v-t graph of a body of 5 kg moving with the help of a force is shown. Then the force involved is_______.
A
20 N
B
12.5 N
C
2.0 N
D
125 N
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Q. 12
What is the SI unit of momentum?
A
Newton
B
Kilogram-metre per second
C
Kilogram
D
Joule
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Q. 13
What force opposes the motion of the marble in practical situations?
A
Friction
B
Tension
C
Gravity
D
Inertia
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Q. 14
Action and reaction forces are always:
A
Equal and in same direction.
B
Unequal and in same direction.
C
Equal and in opposite direction.
D
Unequal and in opposite direction.
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Q. 15
Force remaining constant, if the mass of body increases, its acceleration is likely to:
A
Sometimes increases and sometimes decreases
B
Increase
C
Decrease
D
Remain same
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Q. 16
What happens to the marble if the right-side plane's angle is decreased?
A
It climbs higher
B
It travels further until it stops
C
It rolls back to its original height
D
It falls off the plane
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Q. 17
Quantitative expression of force is given by:
A
Newton’s second law of motion
B
Newton’s law of gravitation
C
Newton’s first law of motion
D
Newton’s third law of motion
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Q. 18
Who deduced that objects move with a constant speed when no force acts on them?
A
Johannes Kepler
B
Isaac Newton
C
Galileo Galilei
D
Albert Einstein
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Q. 19
A body will continue in its state of rest or uniform motion in a straight line, unless acted by some external force. The statement represents:
A
Newton's third law of motion
B
Law of conservation of momentum
C
Newton's second law of motion
D
Newton's first law of motion
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Q. 20
The inertia of an object tends to cause the object ______.
A
to increase its speed.
B
to decrease its speed.
C
to decelerate due to friction.
D
to resist any change in the state of rest or motion.
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Q. 21
While dusting a carpet we beat it with a stick because:
A
No inertia is involved.
B
Force applied on the carpet.
C
Inertia of motion removes the dust.
D
Inertia of rest keeps the dust.
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Q. 22
What effect does an unbalanced force have on an object?
A
It has no effect
B
It only affects light objects
C
It changes the object's speed
D
It stops the object's motion
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Q. 23
If an unbalanced force is removed, what happens to an object's motion?
A
It accelerates
B
It changes direction
C
It continues with the same velocity
D
It stops immediately
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Q. 24
A child on a cart with wheels throws a sandbag forward. As a result:
A
He moves to the right.
B
He moves to the left.
C
He moves backward.
D
He moves forward.
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Q. 25
What happens when you push against a wall?
A
The wall moves away
B
You feel no force
C
The wall pushes back with equal force
D
You fall over
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Q. 26
A cyclist of mass 30 kg exerts a force of 250 N to move his cycle. The acceleration is 4 m/s². The force of friction will be:
A
115 N
B
150 N
C
120 N
D
130 N
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Q. 27
The S.I. unit of force is
A
Newton-metre
B
Newton per square metre
C
Newton
D
Newton per second
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Q. 28
What is the relationship between velocity and momentum?
A
Momentum is independent of velocity
B
They are unrelated
C
Velocity affects momentum
D
Momentum is always zero
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Q. 29
What does Galileo's marble demonstrate when released on an ideal frictionless plane?
A
It moves in a circle
B
It rolls down forever
C
It stops immediately
D
It rolls and returns to the same height
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Q. 30
How does pushing the ground allow you to walk forward?
A
You pull the ground
B
You push the ground backward
C
You exert no force
D
You create a vacuum
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Q. 31
What did Galileo discover about the relationship between time and distance for uniformly accelerated objects?
A
Distance is proportional to time squared
B
Time is irrelevant
C
Distance is proportional to speed
D
Distance is constant
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Q. 32
Newton’s third law of motion explains the two forces ‘action’ and ‘reaction’. These two forces:
A
Always act on different bodies in opposite directions.
B
Have the same magnitude and direction.
C
Always act on the same body.
D
Acts on either body at normal to each other.
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Q. 33
How does mass relate to inertia?
A
More mass means less inertia
B
Mass is unrelated to inertia
C
More mass means more inertia
D
Mass decreases inertia
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Q. 34
What force can change the velocity of a body of mass 1kg from 20 m/s to 30 m/s in 2 seconds?
A
25 N
B
15 N
C
5 N
D
10 N
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Q. 35
A carpenter exerts a force of magnitude 1.5 N at right angles to the surface of a nail of mass 3 grams to drive it into the wood. If wood offers a resistive force of 0.6 N and the time of interaction of hammer and the nail 0.01 s, the depth through which the nail penetrates is:
A
1.5 mm
B
15 cm
C
15 m
D
1.5 cm
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Q. 36
What happens when the brakes are suddenly applied in a moving car?
A
Passengers remain stationary
B
The passengers move backward
C
The car slows down but the passengers lurch forward
D
The car stops instantly
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Q. 37
A force F acts on a stationary body for the time t. The distance covered by the body 'S' will be proportional to:
A
1/t²
B
t
C
1/t
D
t²
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Q. 38
In a high jump competition the athlete is made to fall on a cushioned bed to:
A
Make him stop quickly
B
Make him sleep comfortably
C
To decrease his momentum fast
D
Increase the time to stop
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Q. 39
Which of the following has the largest momentum?
A
A car parked in a parking lot
B
A pickup truck travelling down the highway
C
A cat running down the street
D
A large truck parked in a parking lot
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Q. 40
When no external force acts on an object, the physical quantity that remains conserved is______.
A
momentum
B
force
C
velocity
D
acceleration
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Q. 41
The acceleration of an object is inversely proportional to:
A
Velocity
B
Force
C
Momentum
D
Mass
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Q. 42
What is the momentum of a body of mass 2m and velocity v/2?
A
mv/4
B
mv/2
C
mv
D
2mv
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Q. 43
Change in momentum when a car weighing 700 kg changes its speed from 100 m/s to 200 m/s is:
A
14000 kg·m/s
B
21000000 kg·m/s
C
70000 kg·m/s
D
10500000 kg·m/s
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Q. 44
A person standing on a weighing scale sees a reading on the scale as 148 pounds. This person is acted on by:
A
No forces at all.
B
Two forces of equal magnitude acting in opposite directions.
C
Only one force of 148 pounds, as shown by the reading on the scale.
D
Only one force, of 296 pounds.
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Q. 45
A force F produces an acceleration 'a' in a body. The same force produces an acceleration 4a in another body. The mass of the other body is:
A
Four times the mass of first body
B
Four times less the mass of other body
C
Mass does not play role
D
None of the above
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Q. 46
What major theory did Galileo propose that contradicted prevailing beliefs of his time?
A
Sun revolves around the Earth
B
Stars are fixed in the sky
C
Planets orbit the Sun
D
Earth is flat
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Q. 47
The impact which a body can produce due to the combined effect of mass and velocity is called:
A
Moment of force
B
Force
C
Pressure
D
Momentum
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Q. 48
When the driver of a fast-moving car suddenly applies brakes, the passengers in the car:
A
Fall backward
B
Fall forward
C
Are not affected
D
None of the above
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Q. 49
There is a rubber ball and a stone ball of the same size. If both balls are at rest:
A
Rubber ball has more inertia than stone ball
B
Stone ball has more inertia than rubber ball
C
Both have the same inertia
D
None of the above
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Q. 50
If no external force acts on a body, it will:
A
Break into pieces
B
Move with more speed
C
Either remain in its state of rest or in uniform motion
D
Change its shape
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Q. 51
What invention is Galileo credited with creating around 1640?
A
First pendulum clock
B
First barometer
C
First telescope
D
First microscope
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Q. 52
Which of the following is the relation between SI unit of gravitational force and Newton?
A
1 kg m s⁻² = 1 N
B
1 kg wt = 9.8 N
C
1 dyne = 1 g cm s⁻²
D
1 N = 10⁵ dynes
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Q. 53
The relation between acceleration, mass and force is given by:
A
a x F = m
B
F x m = a
C
a = F/m
D
F = m/a
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Q. 54
The tendency of a body to continue in its state of rest or uniform motion, even on the application of external force is called:
A
Inertia
B
Momentum
C
Force
D
Impulse
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Q. 55
Two balls A and B, of masses m and 2m are in motion with velocities 2v and v respectively. Compare the force needed to stop them in the same time.
A
2 : 1
B
1 : 2
C
1 : 1
D
None of the above
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Q. 56
What does the second law of motion state?
A
Force equals mass times acceleration
B
An object at rest will stay at rest
C
The rate of change of momentum is constant
D
Momentum is independent of mass
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Q. 57
What is the first law of motion also known as?
A
Law of Friction
B
Law of Acceleration
C
Law of Gravity
D
Law of Inertia
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Q. 58
When balanced forces act on a body, the body:
A
Must remain in its state of rest
B
Moving with constant velocity
C
Both (A) and (B)
D
None of the above
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Q. 59
To keep an object moving, what must be applied?
A
Balanced forces
B
Unbalanced forces
C
No forces at all
D
Only frictional forces
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Q. 60
In a football and stone of the same size, the inertia of:
A
Football is greater.
B
Stone is greater.
C
Both objects is equal.
D
None of the above.
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Q. 61
What force is required to accelerate a 2 kg mass at 5 m/s²?
A
6 N
B
8 N
C
10 N
D
12 N
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Q. 62
The acceleration of an object is______.
A
inversely proportional to its mass.
B
directly proportional to the applied force.
C
resisted by inertia.
D
all of the above.
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Q. 63
What happens when two equal forces act on an object?
A
The object moves in one direction
B
The object spins
C
The object does not move
D
The object accelerates
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Q. 64
If no external force acts on a moving object:
A
It will not be affected at all.
B
It should remain in motion but will stop due to friction.
C
It will stop moving.
D
It will remain at rest forever.
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Q. 65
The SI unit of momentum is:
A
Newton
B
Newton-second
C
Dyne-second
D
Dyne
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Q. 66
Equal and opposite forces acting on a body which do not change its state of rest or uniform motion are called:
A
Like parallel forces
B
Unlike parallel forces
C
Balanced forces
D
All the above
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Q. 67
Momentum of a body of mass 0.5 kg moving with a speed of 10 m/s is:
A
5 kg·m/s
B
0.5 kg·m/s
C
2.5 kg·m/s
D
50 kg·m/s
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Q. 68
What did Galileo use to study the motion of objects?
A
Balances
B
Telescopes
C
Pendulums
D
Inclined planes
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Q. 69
A force of magnitude 'F' acts on a body of mass 'm'. The acceleration of the body depends upon:
A
Volume of body
B
Mass of body
C
Density of body
D
Area of body
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Q. 70
The rate of change of momentum is directly proportional to which of the following?
A
Mass
B
Time
C
Velocity
D
Force
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Q. 71
Which of the following is a correctly matched pair?
A
Momentum - Mass x Velocity
B
Acceleration - Rate of change of Momentum
C
Unit of Force - Kilogram per second
D
Second Law of Motion - Force = Mass x Distance
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Q. 72
While catching a stone thrown by your friend you pull your hands back to______.
A
avoid getting hurt.
B
increase the time to slow down.
C
decrease the time to slow down.
D
avoid the breaking of the stone.
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Q. 73
An archer shoots an arrow. Consider the action force to be the bow string against the arrow. The reaction force is the:
A
Grip of the archer’s hand on the bow.
B
Air resistance against the bow.
C
Weight of the arrow.
D
Arrow pushing against bow string.
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Q. 74
Find the time for which a force of 1 kgwt acts on a body of mass 1 kg moving with a uniform speed of 4 m/s to stop the body.
A
0.6 s
B
0.8 s
C
0.4 s
D
0.2 s
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Q. 75
The people in a bus are pushed backwards when the bus starts suddenly because of:
A
Inertia due to direction
B
Inertia due to rest
C
External force
D
Inertia due to motion
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Q. 76
A resistive force of 16 N acts on a ball of mass 40 g continuously. If the initial velocity of the ball is 24 m/s, the time taken by it to come to rest is:
A
0.06 s
B
0.02 s
C
0.08 s
D
0.04 s
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Q. 77
An external influence which changes or tends to change the state of rest or uniform motion of a body or its dimensions is called:
A
Momentum
B
Moment of force
C
Pressure
D
Force
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Q. 78
If you jump off a small boat, what happens to the boat?
A
It moves forward
B
It remains stationary
C
It capsizes
D
It moves backward
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Q. 79
Who further developed Galileo’s ideas on force and motion?
A
Albert Einstein
B
Nikola Tesla
C
Isaac Newton
D
Johannes Kepler
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Q. 80
Momentum is a:
A
Vector quantity
B
Scalar quantity
C
Fundamental quantity
D
None of the above
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Q. 81
The magnitude of inertia of a body is determined by its:
A
Weight
B
Acceleration
C
Mass
D
Velocity
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Q. 82
The unequal and opposite forces acting on a body, which change its state of rest or uniform motion are called:
A
Unlike parallel forces
B
Unbalanced forces
C
Like parallel forces
D
All the above
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Q. 83
What are forces that do not change the state of rest or motion called?
A
Frictional forces
B
Balanced forces
C
Gravitational forces
D
Unbalanced forces
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Q. 84
Why do passengers feel a force when a bus suddenly starts moving?
A
Gravity
B
Friction
C
Acceleration of the bus
D
Inertia of their bodies
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Q. 85
The natural tendency of objects to resist a change in their state of rest or uniform motion is called what?
A
Inertia
B
Friction
C
Momentum
D
Acceleration
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Q. 86
Force of friction always acts in the direction:
A
Of applied force
B
Opposite to the direction of applied force
C
At right angles to the direction of applied force
D
None of the above
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Q. 87
When a bullet is fired from a gun, what happens to the gun?
A
It breaks apart
B
It recoils backward
C
It moves forward rapidly
D
It has no movement
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Q. 88
According to the second law of Newton, force is the cause and the outcome is______.
A
momentum
B
acceleration
C
time
D
velocity
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Q. 89
What property of an object resists changes in its state of motion?
A
Inertia
B
Force
C
Mass
D
Velocity
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Q. 90
When we vigorously shake a branch of a tree, some leaves get detached. It is due to the:
A
Inertia of rest
B
Inertia of motion
C
Some leaves are loosely held by the branch
D
None of the above
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Q. 91
What did Galileo claim to have seen through his telescopes?
A
Rings of Saturn
B
Planets orbiting the Earth
C
Sunspots
D
Mountains on the Moon
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Q. 92
If a body is allowed to freely fall from a height, its speed increases continuously. It is because:
A
Pressure of air forces it downward
B
Magnetic force of earth increases its speed
C
Air does not exert frictional force
D
Gravitational force of earth increases its speed
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Q. 93
Two spring balances pull each other in opposite directions. If the reading of one spring balance is 2 N, the reading shown by the second spring balance will be:
A
3.5 N
B
2.0 N
C
2.5 N
D
3.0 N
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Q. 94
When a running motorbike accelerates suddenly, the pillion rider has a tendency to fall backward. This is an example of:
A
Newton's law of gravitation of motion
B
Newton's third law of motion
C
Newton's first law of motion
D
Newton's second law of motion
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Q. 95
Which is the incorrect statement? A spaceship continues moving in space with uniform speed because:
A
No force of gravitation acts on it
B
Its mass is zero in space
C
No force of friction due to air acts on it
D
No force of friction due to earth acts on it
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Q. 96
How does time influence the force required to change an object’s momentum?
A
Time is irrelevant
B
Shorter time requires more force
C
Longer time requires less force
D
Time has no influence
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Q. 97
What can be said about action-reaction forces?
A
They act on different objects
B
They cancel each other
C
They always act on the same object
D
They can be unequal
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Q. 98
When unbalanced forces act on a body, the body:
A
Must experience acceleration
B
Must move in a curved path
C
Must move with uniform velocity
D
Must remain at rest
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Q. 99
Find the time taken by a body of mass 16 kg to come to rest from a uniform velocity of 10 m/s, when a force of 4N is applied continuously.
A
50 s
B
30 s
C
20 s
D
40 s
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Q. 100
What happens when a small force is applied to a large object?
A
It accelerates rapidly
B
It moves easily
C
It moves with great speed
D
It hardly moves
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Q. 101
Choose the correctly matched pair of action and reaction forces.
A
Action - Pushing the ground backwards
B
Reaction - Bullet acceleration
C
Action - Gun recoil
D
Reaction - Muscular effort on the road
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Q. 102
When a fireman directs a powerful stream of water from a hose-pipe, the hose-pipe tends to go backward. This is due to:
A
Law of conservation of charges
B
Law of conservation of energy
C
Law of Inertia
D
Newton’s 3rd law
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Q. 103
If a block is pulled with unequal forces, what will happen?
A
It will not move
B
It will move in the direction of the smaller force
C
It will move in the direction of the greater force
D
It will rotate
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Q. 104
Why might two objects experience different accelerations when equal forces are applied?
A
They are at rest
B
They have different masses
C
They have the same mass
D
They are in a vacuum
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Q. 105
Which scenario best illustrates Newton's third law of motion?
A
A person pushing a shopping cart
B
A car accelerating on a highway
C
A child swinging on a swing
D
A rocket taking off
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Q. 106
How is momentum defined?
A
Mass times velocity
B
Velocity divided by mass
C
Mass times force
D
Force divided by mass
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Q. 107
What happens if the pushing force exceeds the frictional force?
A
The box bounces
B
The box moves
C
The box stops moving
D
The box rotates
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Q. 108
In a game of football, what happens when a player kicks the ball?
A
The ball does not move
B
The player feels no force
C
Both player and ball exert forces
D
Only the ball moves
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Q. 109
What does the third law of motion state?
A
Force equals mass times acceleration
B
An object at rest stays at rest
C
For every action, there is an equal and opposite reaction
D
An object in motion stays in motion
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Q. 110
In the context of action-reaction forces, what are action and reaction forces?
A
Forces that act on different objects
B
Forces that act on the same object
C
Forces that can change direction
D
Forces that always balance each other
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Q. 111
Which is incorrect statement about action and reaction forces?
A
They act on different objects.
B
They are equal.
C
They act on the same object.
D
They are opposite.
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Q. 112
When is an object said to be in uniform motion?
A
When it changes direction
B
When forces are balanced
C
When forces are unbalanced
D
When friction is zero
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Q. 113
When riding a bicycle, what causes it to slow down when pedaling stops?
A
Gravity
B
Friction
C
Air resistance
D
Balanced forces
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Q. 114
A body P has mass 2m and velocity 5v. Another body Q has mass 8m and velocity 1.25v. The ratio of momentum of P and Q is:
A
2:1
B
3:2
C
1:2
D
1:1
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Q. 115
Which of the following is an equation of motion of a body?
A
Ft = mv - mu
B
v = u + at
C
p = mv
D
F = ma
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Q. 116
Which of the following scenarios demonstrates inertia?
A
A ball rolling downhill
B
A parked car remaining still
C
A car accelerating rapidly
D
A balloon flying away
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Q. 117
What will happen to an object at rest unless acted upon by an unbalanced force?
A
It will accelerate
B
It will remain at rest
C
It will move in a circle
D
It will fall
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Q. 118
In a high jump, landing on a cushioned bed increases what?
A
Risk of injury
B
Time of impact
C
Height of jump
D
Speed of descent
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Q. 119
A player is catching a ball. Consider the action force to be the impact of the ball against the player’s glove. What is the reaction force?
A
Force that the glove exerts on the ball.
B
The player's grip on the ball.
C
Friction of the ground.
D
The muscular effort in the player’s arm.
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Q. 120
What is the term used to describe the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity?
A
Inertia
B
Momentum
C
Acceleration
D
Gravitation
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