5 A student adds weights to an elastic cord. He measures the length of the cord for each weight.
He then plots a graph from the results, as shown.
0
0
weight

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide