KS3 Science Revision

Friction tries to stop objects sliding past each other. Friction allows us to stop moving, without it it would be like walking on ice. However friction wastes energy and creates a maximum speed. It casues us to slow down. Resistance is a type of friction. Air and Water resistance push in the opposite direction to the way we are going in air or water. It is also called drag.

 

For instance, when you jump out of a plain you experience drag. At first you gain speed as you only have gravity pulling you down. But when your parachute opens, the air resistance increases a lot because of the lager surface area. You then reach terminal velocity and travel at a steady speed. You then reach the ground