Question

When does the force of friction come into play?what is the direction of the frictional force vis-a-vis the direction of motion of an object?

Answer 1

Force of friction or frictional force comes into play when a body have a motion or body is in the rest in the rough surface or ground.
When the body is in rest or have tendency to move then it has static friction and when the body is in motion, the kinetic friction may oppose or may support the motion depending on the conditions.
The direction of frictional forces is opposite of the Applied force on the object.

Hope you get your answer.

Answer 2

Answer:

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Force of friction or frictional force comes into play when a body is having motion or the body is resting on a rough surface or ground.

When the body is in rest or having the tendency to move, then it is having static friction.

And when the body is in motion, kinetic friction may oppose or may support the motion depending on the conditions.

The direction of frictional force opposes the applied force on the object.

At least two objects must interact for a force to come into play. Thus, an interaction of one object with another object results in a force between the two objects and no physical contact is necessary.

Hope it helps

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