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# 2 simple machines

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### 2 simple machines

1. 1. Simple Machines
2. 2. <ul><li>Simple machine- a device that does work with only one movement. </li></ul><ul><li>-Machines make work easier by changing the force you exert in size, direction or both. </li></ul><ul><li>-Simple machines try to move something that resists being moved. (Ex: friction or gravity) </li></ul>
3. 3. <ul><li>There are 6 types of simple machines. All are variations of lever or inclined plane. </li></ul><ul><li>Lever Inclined plane </li></ul><ul><li>1. Lever 4. Inclined plane </li></ul><ul><li>2. Pulley 5. Screw </li></ul><ul><li>3. Wheel and 6. Wedge </li></ul><ul><li>axle </li></ul>
4. 4. <ul><li>Lever- a bar that is free to pivot or turn about a fixed point. </li></ul><ul><li>- Fulcrum- fixed point of a lever </li></ul><ul><li>Effort arm- part of the lever where the effort force is applied </li></ul><ul><li>Resistance arm- part of the lever where there is resistance </li></ul>
5. 5. <ul><li>There are different types of levers. </li></ul><ul><li>-1 st class Effort ▲ Resist </li></ul><ul><li>Ex: seesaw </li></ul><ul><li>scissors </li></ul><ul><li>pliers </li></ul>
6. 6. <ul><li>-2 nd class Effort Resist ▲ </li></ul><ul><li>Ex: Stapler </li></ul><ul><li>Wheelbarrow </li></ul><ul><li>Nail clippers </li></ul>
7. 7. <ul><li>-3 rd class Resist Effort ▲ </li></ul><ul><li>Ex: Tweezers </li></ul><ul><li>Swinging a bat </li></ul><ul><li>Fishing rod </li></ul>
8. 8. <ul><li>2. Pulley- a grooved wheel with rope running along the groove. </li></ul><ul><li>There are 3 types of pulleys </li></ul><ul><li>Fixed- the pulley is stationary </li></ul><ul><li>Movable- the pulley can move </li></ul><ul><li>Block and tackle- Fixed and movable put together </li></ul>
9. 9. -Fixed -Movable -Block & Pulley Pulley Tackle Pulley
10. 10. <ul><li>3. Wheel and axle- 2 wheels of different sizes that rotate together. </li></ul><ul><li>Always travel in a circle. </li></ul><ul><li>Effort force is applied to the larger wheel while the smaller wheel (axle) exerts the resistance force. </li></ul>
11. 11. <ul><li>Example of a wheel and axle </li></ul>
12. 12. <ul><li>4. Inclined plane- a sloping surface used to raise objects . </li></ul><ul><li>Ex: a ramp. Using a ramp, you cover more distance but exerts less force. </li></ul>
13. 13. <ul><li>Screw- an inclined plane wrapped in a spiral. </li></ul>
14. 14. <ul><li>6. Wedge- an inclined plane with 1 or 2 sloping sides. </li></ul><ul><li>-Wedges are moving inclined planes. </li></ul><ul><li>Ex: Knife or ax blade. </li></ul>