Question

2. Why is it difficult to move a bike with its brakes on ?

Answer 1

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Explanation:

When we move a bike with its brakes on, the  wheels can only skid, that is, there is sliding friction,  which is more than rolling friction.

and, we know that,

if sliding friction is more than that of rolling friction, then the wheels cannot move.

Hence,

it is difficult to move a cycle with brakeson.

Also,

If the brakes are working correctly it should be difficult to move as there primary function is to prevent the wheels from moving.

Answer 2

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When we move a cycle with its brakes on the tyres can only skid that is, there is sliding friction which is more than rolling friction hence it is difficult to move a cycle with brakes on.