Work is the result of force moving an object. There are two types of energy: potential energy which is stored energy, and kinetic energy which is energy in motion. Energy can be electrical, mechanical, or chemical. Simple machines have few or no moving parts and include levers, inclined planes, wedges, screws, wheels and axles, and pulleys. A compound machine combines two or more simple machines.

1. Energy and Machines How We Work and Play

2. Work is... the result of force moving an object.

3. Force is... a push.

4. Force is... a pull.

6. Potential energy is... stored energy.

7. Kinetic energy is... energy in motion.

9. Electrical energy is... a result of electricity.

10. Mechanical energy is... the energy of moving objects.

11. Chemical energy is... is stored in matter.

12. When two objects rub or touch, there is... friction!

14. When an object is still it tends to remain ... still.

15. When an object is in motion it tends to stay ... in motion.

16. This is the property of ... inertia!

17. A simple machine ... has few or no moving parts.

19. A compound machine is ... a combination of two or more simple machines.