Chapter 7, Problem 17A

How many horizontal forces are exerted on the horse—cart system in Figure 7.14? What is the horizontal net force on the horse—cart system?

To determine

The number of horizontal forces exerted on the horse-cart system.

The horizontal net force on the horse-cart system.

Answer to Problem 17A

Total number of horizontal forces are 2.

The net force is $F-f$

Explanation of Solution

The horizontal forces on the horse-cart system:

The reaction force of the cart on the horse, $F$

The force of friction $f$

So, to accelerate the entire horse-cart system, the net force will be: $F-f$

Conclusion:

Thus, the horizontal net force on the horse-cart system is $F-f$ .