GEOLOGY

Detailed explanation-1: -The frictional force opposes the motion of an object relative to its surface in contact. However, the direction of frictional force may be the same as the direction of motion of the object. For example, during walking we apply a force in the backward direction with our foot.

Detailed explanation-2: -Frictional force offers the resistance to the applied force opposing its motion. Thus, it always acts in the direction opposite to that of the object in motion. If force is applied to the left, then friction acts in the right.

Detailed explanation-3: -Friction is a force that opposes motion. When two objects are in contact, friction is acts in a direction opposite to the motion of the object.

Detailed explanation-4: -The force of friction is the resistance of motion that arises when two objects rub against each other. Hence, this force always acts in the opposite direction of motion of an object.

Detailed explanation-5: -Friction always acts in the opposite direction to movement, i.e. it opposes the motion of an object. Air resistance is a frictional force which opposes motion through air.