What effect does friction have on a moving object?
All kinds of friction cause moving objects to slow down or stop. Friction can be quantified as a force resisting motion which is proportional to the weight of the object, for an object lying on a flat surface. The frictional force is found by multiplying the objects weight by a coefficient of friction, which is usually less than one, but can be higher than one (for example with rubber tyres on dry tarmac). Therefore friction requires a greater force to be applied to move the object. A similar coefficient called the drag coefficient is used to quantify air resistance in vehicles and aircraft-the faster you go the higher the frictional force, in this case.
