1. Thursday Physical Science Simple Machines Identification

2. Calculate your power output For the time your walked, how many 60 watt bulbs you have provided the power needed to light? How valuable was your effort. 1000 watts provided for 1 hour is worth 7-10 cents Value (in cents) = (power) x (time (in hours)) x 8.5

3. Main Purpose of Simple Machines To make work easier to do Change direction of force Change the amount of force or distance traveled

4. Two families of simple machines

5. Inclined plane family Inclined planes Screws Wedge All have slanted surfaces and an object or another surface interaction All have motion of at least one surface/object

6. The lever family Levers Pulleys Wheel and axle All involve rotation about a point

7. Pulleys

8. Wheel and axle

9. Levers Composed of a: Beam Pivot (Fulcrum) Placement of the fulcrum, input force and output force determined the class of lever

10. 1 st class lever Input forceOutput force

11. 2 nd class levers

12. 3 rd class levers

13. Weekend assignment Due Monday: Find and create a picture of a clearly definable simple machine that is used in the real world At least one picture of each type and class of simple machines (8 in all) from the newspaper, magazines, the internet, or from pictures you take, draw or have. These pictures have to show the machine in a real life application Each example should be clearly labeled and all pivots on the levers marked

14. Mousetrap game

15. Real life mousetrap game

16. Rube Goldberg machines A very complicated machine that achieves a very simple purpose