3rd Grade-Ch. 12 Lesson 3 How do simple machines affect work
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  • 1. Ch. 12 Lesson 3 How do simple machines affect work?
  • 2. work
    • When a force moves an object
    • Not done when the position of an object does not change
  • 3. Examples of work
  • 4.  
  • 5. 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
  • 6. When work is done Work Activity
  • 7. Simple Machines
    • help make work easier
    • don’t lessen amount of work
  • 8. 6 kinds of
  • 9. inclined plane
    • slanting surface that connects a lower level to a higher level
  • 10. inclined plane
  • 11.  
  • 12. wedge
    • made up of 2 slanted sides that end in a sharp edge
    • used to split, cut or fasten things
  • 13. wedge
  • 14. screw
    • inclined plane wrapped around a center post
    • used to hold things together & to raise & lower things
  • 15. screw
  • 16. lever
    • stiff bar that rests on a support
    • used to lift & move things
  • 17. lever
  • 18. wheel and axle
    • ex: doorknob
    • wheel =knob
    • axle =post that attaches to its center
  • 19. wheel and axle
  • 20. wheel and axle faucet handle
  • 21. pulley
    • changes the direction of motion to which a force is applied
  • 22. pulley
  • 23. 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
  • 24. 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
  • 25. The 6 Simple Machines 1. Lever 3. Pulley 4. Wheel and Axle 6. Wedge 5. Screw 2. Inclined Plane