Chapter 3, Problem 9STP

To determine

The force required to keep the crate moving with constant velocity.

Answer to Problem 9STP

The force required to keep the crate moving with constant velocity is $90\text{N}$ .

Explanation of Solution

Given info:

Mass of the wooden crate, $m=30\text{kg}$

Force of the sliding friction on the crate, $F=90\text{N}$

Calculation:

The force applied by you will cancel out due to sliding friction that is $90\text{N}$ .So, force required to keep the crate moving with constant velocity is $90\text{N}$ .

Conclusion:

Hence, the force required to keep the crate moving with constant velocity is $90\text{N}$ .