Chapter SH, Problem 3.1APP

To determine

To Calculate: The net force on the box.

Answer to Problem 3.1APP

The net force on the box is $13\text{ N}$ .

Explanation of Solution

Given data:

Force applied on the box $=20\text{ N}$

Force acting on the box due to sliding friction $=7\text{ N}$

Formula used:

Friction opposes the motion of the body.

Calculation:

As per the problem,

Force applied on the box $=20\text{ N}$

Force acting on the box due to sliding friction $=7\text{ N}$

As friction opposes the motion of the body due to applied force, it is subtracted from the applied force.

Therefore net force acting on the box is

  $\begin{array}{l}{F}_{net}=F_{applied}-F_{friction}\\ F_{net}=20\text{ N}-7\text{ N}=13\text{ N}\end{array}$

Conclusion:

The net force on the box is $13\text{ N}$ .