When a wheel is rolling on a level road, what'is the direction of frictional force between the wheel and the road?

What is rolling friction ?

What do we call the gravitational force between the earth and an object?

Explain why friction is necessary to make the disc in Fig. 7.41 roll in the direction indicated. (a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins. (b) What is the force of friction after perfect rolling begins?

What is the direction of force of friction acting on a moving object?

A stone of 1 kg is thrown with a velocity of 20 ms^-1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

What is the ratio of electric and magnetic force between two moving charges.