|Class 8 Physics Friction||Force of Friction|
Friction is a type of forces that opposes motion. It is that forces which always acts in a direction opposite to that of the applied force. In case of a ball freely rolling on the ground, the ball eventually comes to stop, because of the force of friction that acts between the ball and the ground. When the rowing of a boat is stopped, the boat eventually comes to a halt because of friction. It also means that while rowing the force should be greater than the force of friction.
If force acts from right to left (<--), friction acts in left to right direction (-->) (See boat example)
If force acts from left to right (-->), friction acts in right to left direction (<--). (See football example)