If you jounce up and down on a bathroom scale, what varies on the scale reading is
A)mg.
B)the normal force.
C)both of these
D)neither of these

Question

Quizplus · Accepted Answer

When you jounce up and down on a bathroom scale, the force that varies is the normal force. This force is the force with which the scale pushes back on your feet, which in turn is equal in magnitude and opposite in direction to your weight. As you jump, your weight doesn't change, but the normal force does because the scale has to adjust to the changes in pressure as you land and take off, leading to fluctuations in the scale reading. The force mg, which represents your weight, remains constant.

If You Jounce Up and Down on a Bathroom Scale