Chapter 11 Energy and Simple Machines <ul><li>What is energy? </li></ul><ul><ul><ul><li>a. Energy is the ability to do work </li></ul></ul></ul>
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
III. How can energy change? <ul><li>from one form to another </li></ul>a. Light bulb – light energy changes to heat energy b. Blender – electrical energy to sound energy c. Rub hands – mechanical energy to heat energy
IV. What are the two kinds of energy? <ul><li>Kinetic Energy- energy in motion </li></ul><ul><ul><ul><li>1. Light, heat and sound energy </li></ul></ul></ul>b. Potential Energy- stored energy 1. Chemical energy
V What is a simple machine? <ul><li>A machine with very few parts that helps people do work </li></ul>VI. What is are six examples of simple machines? 1. Lever and fulcrum- a machine made from a bar or rod that turns on a point a. helps by placing less effort to lift things (load)
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
5. Screw – an inclined plane wrapped around a post. 6. Wedge – two inclined planes placed back to back
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
VII. What is a compound machine? a. A machine made from two or more simple machines. <ul><li>Bike </li></ul><ul><ul><ul><li>wheels connected to axle </li></ul></ul></ul><ul><ul><ul><li>Pedals are a wheel & axle </li></ul></ul></ul><ul><ul><ul><li>Handbrakes are a lever and fulcrum </li></ul></ul></ul>Edhead Game
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