Name
Date
Tracking energy conservation — Homework
Use energy in = useful energy out + wasted energy for each problem.
- 1.A machine receives 200 J and outputs 150 J of useful work. How much was wasted?
- 2.A ball has 45 J of PE at the top and 38 J of KE at the bottom. How much was wasted?
- 3.A motor wastes 12 J out of 80 J received. How much useful energy did it produce?
- 4.Why is it inaccurate to say a swinging pendulum "loses" energy over time?
- 5.Explain the difference between "energy is conserved" in science and "please conserve energy" on a poster.
🌲 Homeschool of the FutureEighth Grade · Science · week 13 homework