Force and Law of Motion

This is an MCQ-based quiz on Force and Law of Motion.

This includes uniform, accelerated, and retarded motion

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Among the equal-sized stone and a football, the inertia will be higher of:

football stone both none of them

What is the momentum of an object of mass m, moving with a velocity v?

(mv)^2 mv^2 1/2 mv^2 mv

When an object is released from a height, its initial velocity is:

u = 100 ms-1 u = 9.8 ms-1 u = 0 u = \(\frac{1}{2}\)

A batsman hits a cricket ball which then rolls on the ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because:

The batsman did not hit the ball hard enough.

Velocity is proportional to the force exerted on the ball.

There is a force on the ball opposing the motion.

There is no unbalanced force on the ball so the ball would want to come to rest.

Friction is___________:

Useful to us

Harmful to us

Both useful as well as harmful to us

None of them.

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to

exert larger force on the ball reduce the force exerted by the balls on the hands increase the rate of change of momentum decrease the rate of change of momentum

A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is

accelerated uniform retarded along circular tracks

The inertia of an object tends to cause the object

To increase its speed

To decrease its speed

To resist any change in its state of motion

To decelerate due to friction

According to the third law of motion, action and reaction

Always act on the same body

Always act on different bodies in opposite directions

Have same magnitude and directions

Act on either body at normal to each other

An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a friction less horizontal table. The force required to keep the object moving with the same velocity is:

32 N 0 N 2 N 8 N

Newton’s third law of motion explains the two forces namely ‘action’ and ‘reaction’ coming into action when the two bodies are in contact with each other. These two forces:

Always act on the same body Always act on the different bodies in opposite directions Have same magnitude and direction Acts on either body at normal to each other

The speed of a car weighing 1500 kg increases from 36 km/h to 72 km/h uniformly. What will be the change in momentum of the car?

15000 kg km/h 15000 kg m/s 54000 kg m/s 54000 g m/s

A water tank filled upto 2/3 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

Move backward Move forward Come to the rest Be unaffected

An athlete does not come to rest immediately after crossing the winning line due to the

Inertia of motion Inertia of rest Inertia of direction None of these

Inertia is the property of a body by virtue of which, it cannot change by itself

Its state of rest Its steady state of uniform motion Its direction of motion All of these.

Which of the following is not an application of conservation of linear momentum?

While firing a bullet, the gun must be held tight to the shoulder When a man jumps from a boat to the shore A rocket explodes on midway from the ground A body suspended from the hook of a spring balanced in a lift which is accelerated downward

The masses of two bodies are in ratio 5 : 6 and their velocities are in ratio 1 : 2. Then their linear momentum will be in the ratio

5 : 6 1 : 2 12 : 5 5 : 12

When we stop pedalling, the bicycle begins to slow down. This is because of the

Frictional force acting along the direction of motion of bicycle

Air resistance which is in the direction of motion

Frictional force acting opposite to the direction of motion of bicycle by the road

Nature of the bicycle to stop after some time

Quiz/Test Summary

Title: Force and Law of Motion

Questions: 18

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