3. II. What are the six forms of energy? a. Light Energy- light bulbs b. Sound Energy- radio, voices c. Heat Energy (thermal)- sun, light bulb d. Electrical Energy- vacuum, tv e. Mechanical Energy – bike, car f. Chemical Energy- food, gasoline
4.
5.
6.
7.
8.
9.
10.
11.
12.
13. 2. Wheel and Axle- has a wheel connected to an axle 3. Inclined Plane- a machine made from a slanted surface 4. Pulley – a machine made from a grooved wheel and a rope or chain. a. small effort needed to move things a. small effort needed to move things a. Easier to lift things
14.
15.
16.
17. 5. Screw – an inclined plane wrapped around a post. 6. Wedge – two inclined planes placed back to back
18.
19.
20. VII. What is friction and how does it affect a simple machine? a. Friction is a force that slows down or stops motion b. Friction makes it harder for a simple machine to work c. Friction can be reduced by adding wheels or covering surfaces with oil or grease
![Chapter 11 Energy and Simple Machines ,[object Object],[object Object]](https://image.slidesharecdn.com/chapter-11-forces-less-123-1216167810346357-8/85/Forces-1-320.jpg)
