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Cynthia O’Connor SOL 3.2 Amelia Elementary School

Simple Machines. Cynthia O’Connor SOL 3.2 Amelia Elementary School. Simple Machines are tools that make work easier. They have few or no moving parts. They do not have motors. There are six simple machines. Lever Incline plane Wedge Screw Pulley Wheel and axle

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Cynthia O’Connor SOL 3.2 Amelia Elementary School

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  1. Simple Machines Cynthia O’Connor SOL 3.2 Amelia Elementary School

  2. Simple Machines are tools that make work easier. • They have few or no moving parts. • They do not have motors.

  3. There are six simple machines • Lever • Incline plane • Wedge • Screw • Pulley • Wheel and axle * gears

  4. Lever • The lever is a stiff bar that rests on a support called a fulcrum.

  5. There are 3 parts to a lever. *Force *Fulcrum *Load The hand is applying force, this is called effort.

  6. How does the lever help us do work? • The lever lifts or moves loads. • Examples: shovel, see saw, crowbar, hammer, and baseball bat

  7. Incline Plane • A plane is a flat surface • An incline plane is a slanted surface connecting a lower level to a higher level

  8. How does the incline plane help us do work? • An incline plane makes it easier to move heavy objects up or down. • Examples: ramp, slide, and stairs

  9. Wedge • The wedge is wide at one end and pointed at the other. • If you look closely you will see that the wedge is 2 incline planes joined back to back.

  10. How does the wedge help us do work? • The wedge cuts or spreads objects apart. • Examples: axe, zipper, knife, and saw

  11. The screw is an incline plane wrapped around a cylinder or pole. Screw

  12. How does the screw help us do work? • The screw holds things together or lifts • Examples: Jar lid, screw, drill, and light bulb.

  13. Pulley • The pulley is a grooved wheel that has a rope wrapped around it.

  14. How does the pulley help us do work? • The pulley can be used to lift heavy objects by changing the direction or amount of the force. Examples: • Flagpole, curtain rod, and tow truck.

  15. The wheel and axle is a wheel with a rod called an axle through its center; both parts move together. Wheel and Axle

  16. How does the wheel and axle help us do work? • The wheel and axle makes it easier to move or turn things. • Examples: Bicycle wheels, roller skates, and a door knob

  17. Gears are wheels with teeth. When the gears are place together they have to be fitted into the teeth. Gears

  18. How do gears help us do work? • Gears are used to slow things down or speed them up, to change directions • Examples: Back wheels of cars and motorcycles and clocks

  19. Put on your thinking caps.

  20. A. incline plane B. wedge C. wheel and axle D. pulley 1.) What simple machine is the doorknob?

  21. 2.) What simple machine are the stairs? • A. incline plane • B. wedge • C. pulley • D. screw

  22. A. pulley B. lever C. wedge B. screw 3.) What simple machine is the jar lid?

  23. A. incline plane B. lever C. pulley D. screw What simple machine is the baseball bat?

  24. 5.) What simple machine is the door jam? • A. pulley • B. wheel and axle • C. wedge • D. incline plane

  25. Compound Machines • Compound Machines are two or more simple machines working together to make work easier.

  26. Can you tell what are the simple machines that make up the compound machines?

  27. A. lever and wedge B. pulley, wheel and axle C. wheel and axle, screw D. wedge and pulley 1.) What are the simple machines in the pencil sharpener?

  28. 2.) What are the simple machines in the bicycle? • A. pulley, wheel and axle • B. lever and wedge • C. wheel and axle, lever • D. screw and incline plane

  29. 3.) What are the simple machines in the fan? • A. incline plane and pulley • B. wheel and axle, lever • C. lever and wedge • D. pulley and wheel and axle

  30. A. lever and wedge B. incline plane and lever C. pulley and wedge D. wheel and axle, wedge 4.) What are the simple machines in the scissors?

  31. A. wedge and lever B. wheel and axle, lever C. incline plane and screw D. lever and pulley 5.) What are the simple machines in the dolly?

  32. Simple Machine quiz 1. Cdoorknob -(wheel and axle) 2. Astairs -(incline plane) 3. Bjar lid –(screw) 4. B baseball bat –(lever) 5. Cdoor jam –(wedge) Compound Machine Quiz 1. Cpencil sharpener- (wheel and axle, screw) 2. Cbicycle – (wheel and axle, lever) 3. Dfan – (wheel and axle, pulley) 4. A scissors – (lever and wedge) 5. Bdolly – (wheel and axle, lever) ANSWERS

  33. This power point was created by Cynthia O’Connor who reserves all rights thereto. Any commercial use of this work is prohibited without the express written consent of the author.

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