Question

1) Explain the reasons for the following.
a) When a carpet is beaten with a stick dust comes out of it
b) Luggage kept on the roof of a bus is tied with a rope
c) A pace bowler in cricket runs
in from a long distance before he bowls​

Answer 1

Answer:

a) the reason is the dust was in the state of rest and force is applied on it and it came in the state of motion so the dust particles comes out

b) because at that time time the bus would be in the state of motion and when the bus would come in the state of rest the luggage would be in state of motion and it will fall down

Answer 2

Answer:

a) when a carpet is beaten with a stick, dust comes out of it.

• the dust particles in the carpet are at rest.
• when the carpet is beaten with a stick, the state of rest of the dust particle is disturbed.
• due to inertia, the dust particles come out.

b. luggage kept on the roof of a bus is tied with a rope.

• luggage kept on the roof of a bus is in the state of rest.
• as the bus moves, the luggage also moves with a velocity equal to the velocity of the bus.
• if the bus suddenly stops the luggage resists how to change its state of motion.
• hands due to inertia it will fall down.
• to avoid this the luggage is tied with rope.

c. a pace bowler in cricket runs in from a long distance before he bowls.

• when he runs from a long distance he gains momentum of inertia.
• due to this larger image of inertia force is applied in a short interval of time.
• hence the momentum will be more.

hope it helps you.......