3.5 Calculating Energy
Examples
Calculate the increase in potential energy in the following examples.
Example #1:
 |
Carol is bench pressing 85 kg (about 800N). If each rep requires her to lift the bar about 1.0 m, how much potential energy does Carol increase the weights during a push up? Give it a try before checking the solution. |
Example #2:
 |
Val pulls back a bearing in her new sling shot. She pulls it back about 30 cm with an average force of 100N. What is the increase in potential energy caused by pulling it back? Give it a try before checking the solution. |
Example #3:
 |
A 0.5 N pendulum is swinging. At the very top of its swing, it is 12 cm above its lowest position. What is the difference in potential energy between lowest and highest positions? Give it a try before looking at the solution. |
