There are two surfaces, A and B in contact with each other. Consider the following situations: Situation I: Both A and B are at rest. Situation II: A is moving while B is at rest and A is over B. Situation III: A is at rest while B is moving and A is over B. Situation IV: A is at rest while B is moving and B is over A. In which of the given situations would you expect frictional force to come into play?

There are two surfaces, A and B in contact with each other. Consider t

1.	There are two surfaces, A and B in contact with each other. Consider the following situations: Situation I: Both A and B are at rest. Situation II: A is moving while B is at rest and A is over B. Situation III: A is at rest while B is moving and A is over B. Situation IV: A is at rest while B is moving and B is over A. In which of the given situations would you expect frictional force to come into play?
Answer» There are two surfaces, A and B in contact with each other. Consider the following situations: Situation I: Both A and B are at rest. Situation II: A is moving while B is at rest and A is over B. Situation III: A is at rest while B is moving and A is over B. Situation IV: A is at rest while B is moving and B is over A. In which of the given situations would you expect frictional force to come into play?