Chapter 9, Problem 65A

To determine

The internal force of a car's brakes brings the car to stop.

Explanation of Solution

Introduction:

Internal forces do not change the mechanical energy of an object but it changesone form of energy to other form. Internal force can change the part of kinetic energy to potential energy.

A moving car is stopped by applying thebrakes of the car. When the brakes, are applied the frictional force between road and tire increases.

This opposes the motion of a car and stops the car.

Conclusion:

Frictional force between the road and tire increases.