Chapter 5, Problem 1P

To determine

To Explain:Some of the objects might stay stationary on the floor while others might slip backward on the floor.

Explanation of Solution

Introduction:

Static frictional force: The object remains at rest till the applied force on the object equals the static frictional force. It is self-adjusting force and varies from $0\text{ to }\mu N$ where $N$ is the Normal reaction and $\mu$ is the coefficient of static friction. If the magnitude of the applied force becomes greater than the static frictional force, then only the object moves

Kinetic frictional force: It is less than the maximum static frictional force. When the applied force is greater than the static frictional force, the object moves, then the kinetic friction acts.

Static friction and kinetic friction play role in objects to slip. If the static friction is large, the object does not slip. If the applied force is large, the coefficient of static friction should be large to prevent object from slipping.