Question

Give reasons of the following a) Dust comes out of the mat when beaten with a stick
b) We fall in the forward direction when bus applies the brakes.
c) Birds fly in the air

Answer 1

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 to move but the dust particles remain at rest due to inertia at rest, thus the dust gets detached from the carpet.

We fall in forward direction when a moving bus apply brakes because when the bus was moving, our upper part of body and the bus both are in motion, and when the bus apply brakes our body tries to be in motion because of inertia of motion and experiences a forward push