Question

It is a matter of common experience that when we roll a ball along the ground
the ball does not continue to 'keep on moving' for long. It slows down and finally
comes to rest.
Now consider this situation: we are riding a bicycle, and after attaining a good speed
we stop pedalling. The bicycle would be seen to gradually slow down and would stop
after covering a certain distance. To make it move with a constant speed, even along
a straight level road, we have to 'keep on' pedalling it.
In the last chapter, we learnt that we need an external force to change the speed, or
direction of motion, of an object that may be initially at rest or in motion. Why do
objects, like the rolled out ball or the moving bicycle, slow down and finally come
to rest, after the force acting on them, has been removed? Why does not the object
keep on moving with a constant speed along its straight path, after the removal of
the applied force?
In terms of our ideas about the effects of force, we can now realise that there must
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Answer 1

Answer:

Frictional force is exert to every object.

Explanation:

if you are riding bicycle you have to paddle because there is a force exerted opposite to the direction in which you are exerting force.