Two identical boxes are placed on opposite ends of the board of a playground seesaw as in Figure P12.90a, so that the system is in mechanical equilibrium.

(a) What happens to that equilibrium if you exert a small, brief force, either upward or downward, on either end of the board?

(b) With the boxes attached to the underside of the board as in Figure P12.90b and the system again in mechanical equilibrium, what happens to the equilibrium if you exert such a force on either end?

Data from Figure P12.90

Transcribed Image Text:

(a) A (b)