Chapter 2, Problem 12A

What two forces compress a spring inside a weighing scale when you weigh yourself?

To determine

The two forces that will compress a spring inside a weighing scale.

Answer to Problem 12A

The two forces compress a spring inside a weighing scale is the gravity force and the support force.

Explanation of Solution

Introduction:

Support force is the force that balances the weight of an object on the surface. It always acts in upward direction. It is also termed as the normal force.

The weight of the person acts in the downward direction due to gravity. The support force is equal to the weight of the person and opposite in direction. So the net force acting on the system is zero at mechanical equilibrium. The spring force on the weighing scale is compressed by the weight of the person and the support force. Hence, the two forces that will compress a spring inside a weighing scale is the gravity force and the support force.

Conclusion:

Thus, the two forces compress a spring inside a weighing scale is the gravity force and the support force.