3rd Grade-Ch. 12 Lesson 3 How do simple machines affect work
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3rd Grade-Ch. 12 Lesson 3 How do simple machines affect work

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3rd Grade-Ch. 12 Lesson 3 How do simple machines affect work 3rd Grade-Ch. 12 Lesson 3 How do simple machines affect work Presentation Transcript

  • Ch. 12 Lesson 3 How do simple machines affect work?
  • work
    • When a force moves an object
    • Not done when the position of an object does not change
  • Examples of work
  •  
  • When work is done Trying to scoop rock-hard ice cream Opening an unlocked door Pulling on a locked door Lifting a puppy Holding a puppy Turning a jump rope Thinking about a math problem Work Activity
  • When work is done Work Activity
  • Simple Machines
    • help make work easier
    • don’t lessen amount of work
  • 6 kinds of
  • inclined plane
    • slanting surface that connects a lower level to a higher level
  • inclined plane
  •  
  • wedge
    • made up of 2 slanted sides that end in a sharp edge
    • used to split, cut or fasten things
  • wedge
  • screw
    • inclined plane wrapped around a center post
    • used to hold things together & to raise & lower things
  • screw
  • lever
    • stiff bar that rests on a support
    • used to lift & move things
  • lever
  • wheel and axle
    • ex: doorknob
    • wheel =knob
    • axle =post that attaches to its center
  • wheel and axle
  • wheel and axle faucet handle
  • pulley
    • changes the direction of motion to which a force is applied
  • pulley
  • Simple Machines Game
    • Simple Machines game
    • http://staff.harrisonburg.k12.va.us/%7Emwampole/1-resources/simple-machines/index.html
    • http://sunshine.chpc.utah.edu/javalabs/java12/machine/index.htm
    • http://www.galaxy.net/~k12/machines/index.shtml
    • http://www.quia.com/pages/hostetterscience.html#simple
    • How can we move our principal game
  • Simple Machines Activities
    • http://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm
    • http://www.mikids.com/Smachines.htm
    • http://teacher.scholastic.com/dirtrep/simple/index.htm
  • The 6 Simple Machines 1. Lever 3. Pulley 4. Wheel and Axle 6. Wedge 5. Screw 2. Inclined Plane