Friction force Table Of Contents Definition of friction Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. Frictional forces, such as the traction needed to walk without slipping, may be beneficial , but they also present a great measure of opposition to the motion . Explanation The amount of friction depends on the materials from which the two surfaces are made. The rougher the surface, the more friction is produced. Friction also produces heat . If you rub your hands together quickly, you will feel them get warmer. Friction can be a useful force because it prevents our shoes from slipping on the pavement when we walk and stops car tyres from skidding on the road. When you walk, friction is caused between the tread on sho...
