Question 1

When a carpet is beaten with a stick, dust comes out of it. Explain.

Accepted Answer

When a carpet is beaten with a stick, the dust comes out of it because of law of inertia.Initially the dust particles are at rest along with the carpet. Beating the carpet with the stick makes the carpet move but the dust particles remain at rest due to inertia of rest, thus the dust gets detached from the carpet.

Question 2

Which of the following has more inertia ?A rubber ball or a stone of the same size.

Accepted Answer

The mass of a rubber ball is much less than that of a stone of same size.A body of greater mass has more inertia, hence a stone has more inertia.

Question 3

An athlete runs some distance before taking a long jump, because:

Accepted Answer

An athlete runs before jumping to gain momentum because it helps in jumping higher and longer because of the inertia of motion gained due to motion. When the athletes jump, they already have a forward motion that would be greater than that of a jump made from standing in one spot. While running, the athlete cannot gain energy or apply larger force because initially, he would be rest and while running, he will lose energy.

Question 4

When a bus starts suddenly, the person falls backwards because of

Accepted Answer

When a bus starts suddenly,the person falls backwards because of inertia of rest of passenger.This is due to the fact that because of their inertia ,the passengers tend to remain in their state of rest when the bus starts suddenly.

Question 5

A water tanker filled up to $\frac{2}{3}$ of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would:

Accepted Answer

As per Newton's first law of motion or law of inertia, any object keeps moving in the same direction with the same speed as long as no external force is applied to it. In this case, water will keep moving forward when brakes are applied. The tanker will stop but water will continue moving and might overflow if the tanker has no closed roof.

Question 6

Mass is a measure of inertia of the body.

Accepted Answer

Greater the mass, greater is the force required to change its state of rest or of uniform motion.

Question 7

When a tree is shaken, its fruits and leaves fall down: why?

Accepted Answer

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 8

Two balls of the same size but of different material, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed?
Give reason for your answer.

Accepted Answer

Yes, the balls will starts rolling in the direction in which the train was moving. Due to the application of the brakes, the train comes to rest but due to inertia the balls try to remain in motion, therefore they begin to roll. Since the mass of the balls are not same, therefore , the inertia of iron ball is greater than rubber ball due to mass. Thus, the rubber ball will move fast.

Question 9

There are three solids made up of aluminium, steel and wood, of the same shape and same volume. Which of them would have highest inertia ?

Accepted Answer

Steel would have the highest inertia.As the mass is a measure of inertia, the ball of same shape and size, having more mass than other balls will have highest inertia. Since steel has greatest density and greatest mass among the three, therefore, it has highest inertia.

Question 10

The inertia of an object tends to cause the object:

Accepted Answer

Toppr Ask Answer

Galileo's Experiment for Motion

Language

Rate

REVISE WITH CONCEPTS

Galileo's experiments on Inertia

First Law of Motion

QUICK SUMMARY WITH STORIES