​Elastice Potential is energy that is being stored due to a stretched or compressed material.

This equation will help you keep track of Mechanical Energy during common conversions!

Notice as the pendulum swings, it will always have the same TE (TOTAL ENERGY).

• highpoint of the swing = high PE and low KE.

• lowpoint of the swing = high KE and low PE.

Notice that the Total Energy is always 50,000 J

Notice that the red KE column and Blue PE column always add up to the yellow Total Mechanical Energy Column!

Notice at the beginning there are a total of 40,000 J of energy.

Why doesn't the ping pong ball bounce back up to the original height?