What is the direction of force of friction?

cbse
lawsofmotion

#1

The force of friction is opposite to the direction of applied force and along the interacting surfaces. It is generally opposite to the direction of motion provided the cause of motion is now the force of friction itself, e.g., front wheel of a bicycle moves when placed on the ground but remains stopped when lifted from the ground. In this case force of friction is in the direction of motion because cause of motion is friction itself.