Why does oiling the axles of bicycle make the bicycle move more easily ?

A bug is crawling with constant speed v, along the spoke of a bicycle wheel, of radius a while the bicycle moves down the road with constant speed v. Find the accelerations of the bug as observed by a man standing beside the road, along the perpendicular to the spoke of the wheel.

A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the truck or on the bicycle ? Give a reason to support your answer.

Why does the air filled in a bicycle tube keep it tight?

Why spokes are provided in a bicycle wheel ?

Why do brake pads of bicycles have to be replaced quite often ?

What type of motion does the wheel of a bicycle have ?

In summer, when the valve of a bicycle tube is removed, the escaping air appears cold. Why?

Why do the tyres of a bicycle feel hard when air is filled in the tubes inside them.