Force of Friction and Its Types

Explain why sliding friction is less than static friction?

What kinds of friction do you know?

Explain how can you measure frictional force?

Give examples showing the existence of sliding friction.

Give examples of practical application of static friction.

What conditions are needed for static friction to come into play?

Does friction act on a table resting on the floor?

When do we speak of sliding friction?

What observations and experiments can you cite to show the existence of friction?

Does friction oppose the motion or relative motion of surfaces in contact? Discuss.