Free-Body 1 | Free-Body 2 | Free-Body 3 | Free-Body 4

Please wait for the animation to completely load.

A red block is pushed and moves as shown in the animation. In addition, a green block sits on the red block and moves as well. Restart.

1. Which free-body diagram is correct? Give reasons why the other three diagrams are incorrect.
2. How would your answer to (a) change if the blocks did not move?