State the laws of kinetic friction.
Answers
Answer:
Wrote down in the explanation.
Explanation:
1. When the surfaces move, the friction remains constant.
2. Its value F depends on: 1) The kind of surfaces, and 2) the magnitude of the normal force, N.
3. F = mk N, where mk is the “coefficient of kinetic friction.” mk is always smaller than ms for the same two surfaces.
Also you should know:
The fact that the coefficient of static friction is generally larger than the coefficient of kinetic friction has practical consequences.
For example, to stop a car most efficiently, the magnitude of the friction force between rubber and road must be kept just below the maximum value allowed by the law of static friction. When that value is exceeded, the tires start to skid, and the friction falls to the smaller value implied by the law of kinetic friction. Similar considerations apply when turning corners or trying to accelerate rapidly.