#1 the water held back by a dam is an example of which type of energy?
(a) chemical energy
(b) mechanical energy
(c) kinetic energy
(d) potential energy
#2 a swinging pendulum demonstrates which type of energy?
(a) both potential and kinetic energy
(b) chemical energy
(c) only kinetic energy
(d) only potential energy
#3 how can you increase the period of a pendulum?
(a) by making the string longer
(b) by making the string shorter
(c) by taking away mass
(d) by adding mass