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Simple and Compound Machines

Simple and Compound Machines. What are Simple Machines?. A device that allows work to be performed with less effort A device with few or no moving parts A device that makes work easier by changing force, distance, or by changing the direction of the force. What are Compound Machines?.

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Simple and Compound Machines

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  1. Simple and CompoundMachines

  2. What are Simple Machines? • A device that allows work to be performed with less effort • A device with few or no moving parts • A device that makes work easier by changing force, distance, or by changing the direction of the force What are Compound Machines? Two or more simple machines working together to make the work easier

  3. The 6 Simple Machines

  4. Lever A rigid bar used to exert a pressure or sustain a weight by pivoting on its fulcrum

  5. Parts of a Lever If the fulcrumis located at the midpoint of the lever armand the effortis equal to the load, then the lever will be perfectly balanced. Lever Arm Effort Load Fulcrum

  6. Types of Levers You can identify the different types of levers by the middle component. Can you identify each type of lever on the next slide?

  7. Examples of Levers

  8. Wheel & Axle A wheel is a lever arm that is fixed to a shaft, which is called an axle. The wheel and axlemove together as a simple lever to lift or to move an item by rolling.

  9. Examples of Wheel & Axles

  10. Pulleys A grooved wheel around which a rope, belt, or chain passes Used to change the direction or magnitude of a force

  11. Examples of Pulleys

  12. Pulley Systems

  13. Inclined Plane Flat surface set at an angle or incline Most common inclined plane is a ramp Able to lift objects by pushing or pulling the load

  14. Examples of Inclined Planes

  15. Wedge Functions as a moving inclined plane Tapers to a thin edge and is used for splitting or for tightening by being driven into something

  16. Examples of Wedges Almost all cutting tools make use of the wedge.

  17. Screw An inclined plane wrapped around a cylinder, forming the path and pitch Pitch is the distance between two threads A screw is used as a threaded fastener. It changes rotary motion to linear force.

  18. Examples of Screws

  19. What Kind of Simple Machine Is This? Wedge Pulley Wheel and Axle Screw Inclined Plane Lever

  20. Compound Machines • Compound machines consist of two or more simple machines put together. • Most devices are compound machines. • They can do more difficult jobs because their mechanical advantage is greater. What two simple machines are in scissors? First Class Lever and Wedge

  21. Name the Simple Machines Present in Each Compound Machine

  22. Image Resources Microsoft, Inc. (2009). Clip Art. Retrieved January 22, 2009, from http://office.microsoft.com/en-us/clipart/default.aspx

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