Friction Test -...

Friction is not required in which of the following cases?

Frictional force is nearly negligible on :

Driving a car on a wet road is difficult because water

If rough surface is polished beyond a certain limit than the magnitude of frictional force will

From following statements choose the correct combination.
A. Grease is used to reduce friction in bicycle chain
B. Ball bearings are used to reduce friction in a fan
C. Oil can be used to increase friction in a car engine.
D. Talc can be used to reduce friction when an object is sliding on a surface. 

In which of the following cases the net force is not equal to zero?

The application of decreasing friction includes :

Which of the following activity would not be possible in the absence of friciton?

The friction of the surface of a wooden bench can be increased by;

What would happen to a moving object if there would be no friction?