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Question Question 3
Why is it advised to tie any luggage kept on the roof of a bus with a rope?
When some luggage is placed on the roof of a bus which is initially at rest, the acceleration of the bus in the forward direction will exert a force (in the backward direction) on the luggage due to luggage's inertia of rest.
On the other hand, when a moving bus suddenly stops due to the application of brakes, a force (in the forward direction) is exerted on the luggage due to luggage's inertia of motion. Hence, tying the luggage will secure its position and prevent it from falling off the bus.