The force which opposes the relative motion of two surfaces of the bodies which are in contact is called

… friction is self adjusting force.

Because of friction …. of surfaces increases.

When one body rolls over the surface of another body, the friction offered is called …

… and … are called fluids.

The length of the spring is proportional to …

If we rub our hands, heat is generated by

The substances which reduce friction are called as

Friction is not depends upon

If there is no heat shield covering over the space craft shuttle, it will

Opposite to acceleration is

If you push a ball which is in the rest on a ground, then its speed

In which of the following surface a ball move fastly?

If you increase normal force, then

A push or a pull is called