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Simple Machines

Simple Machines. Machine – a tool that helps us do work with less force. Machines help us by: Changing the amount of force on an object. Changing the direction of the force. Lever Inclined Plane Wedge Screw Wheel and Axle Pulley. Six basic simple machines :.

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Simple Machines

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  1. Simple Machines

  2. Machine – a tool that helps us do work with less force Machines help us by: • Changing the amount of force on an object. • Changing the direction of the force.

  3. Lever Inclined Plane Wedge Screw Wheel and Axle Pulley Six basic simple machines:

  4. LEVER A bar that pivots on top of a fixed point called a fulcrum. It is used to lift or move a load.A lever operates on the principle that a force applied at one point lifts a resistive weight at a second point by rotating it about the fulcrum.There are three classes or types of levers. Lever examples: a seesaw, crowbar, baseball bat, rake, hammer, shovel, tweezers

  5. Three Classes of Levers An example of a first class lever is a seesaw. An example of a second class lever is a wheelbarrow. An example of a third class lever is a fishing pole.

  6. Lever Video

  7. INCLINED PLANEA slanted flat surface with one end raised higher than the other. An inclined plane makes it easier to slide a load up or down rather than having to directly lift it.There are no moving parts in an inclined plane. Examples: ramp, stairs, slide, roof, escalator, gangplank, driveway

  8. Inclined Plane Video

  9. WEDGETwo inclined planes put together. A wedge is used to raise an object or split an object. Examples: knife, doorstop, ax, needle, pin, nail, saw

  10. Wedge Video

  11. SCREWAn inclined plane wrapped around a pole or cylinder. A screw is used to hold materials together. Examples: drill bit, screws, spiral staircase, corkscrew, meat grinder

  12. Screw Video

  13. WHEEL AND AXLEA wheel with a rod called an axle through the center. The wheel turns on the axle to help lift or move a load quickly and easily. Examples: steering wheel, doorknob, screwdriver, tractor wheel, car, pencil sharpener, bike

  14. Wheel and Axle Video

  15. PULLEYA wheel with a rope or chain wound around it. A pulley can move a load up or down or change the direction of a force. Examples : flagpole, clothesline, cranes, fishing reel, sailboat mast

  16. Pulley Video

  17. Scenario 1 • I have a bucket of paint I need to get to the painters on the third floor of a building. What simple machine would be best for the job and why?

  18. Scenario 2 • I need to chop a piece of wood, so it will fit in my fireplace. What simple machine would be best for the job and why?

  19. Scenario 3 • My grandmother is in a wheelchair and needs to get on stage for a performance. What simple machine would be best for the job and why?

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