Simple machines
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Simple machines

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Simple machines Simple machines Presentation Transcript

  • Simple Machines SOL 3.2
  • Machine – a tool that helps us do work Machines help us by: 1. Changing the amount of force on an object. 2. Changing the direction of the force.
  • Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it.
  • Energy is the ability to do work. Example: I must have energy to run the mile.
  • Work is the result of force moving an object. Example – Picking up something heavy is hard work!
  • Gravity Gravity is the force that constantly pulls objects toward Earth.
  • Simple machines – have few or no moving parts • • • • • • Lever Inclined Plane Wedge Screw Wheel and Axel Pulley
  • Lever –made of a board or bar set on top of a fulcrum. It is used to lift weight Example: seesaw, crowbar, baseball bat, rake
  • Inclined Plan – a slanted surface to make lifting easier Example: ramp, stairs
  • Wedge – two inclined planes together used to raise an object or split an object. Example: knife, door wedge, ax
  • Screw – an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes. Example: drill bit, screws
  • Wheel and Axel – a wheel that turns on a post to help move things quickly and easily Example: steering wheel, doorknob, screwdriver
  • Pulley – made of rope and string wound around a reel to change the direction of a force. Example : flagpole, clothesline, cranes, fishing reel
  • Compound Machine – two or more simple machines working together. Examples: Bike Car
  • How Work is Done Energy Force Function Work is done!