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Ch. 12 Lesson 3  How do simple machines affect work?
work <ul><li>When a force moves an object </li></ul><ul><li>Not done when the position of an object does not change </li><...
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 Ho...
When work is done Work Activity
Simple Machines <ul><li>help make work easier </li></ul><ul><li>don’t lessen amount of work </li></ul>
6 kinds of
inclined plane <ul><li>slanting surface that connects a lower level to a higher level </li></ul>
inclined plane
 
wedge <ul><li>made up of 2 slanted sides that end in a sharp edge </li></ul><ul><li>used to split, cut or fasten things </...
wedge
screw <ul><li>inclined plane wrapped around a center post </li></ul><ul><li>used to hold things together & to raise & lowe...
screw
lever <ul><li>stiff bar that rests on a support </li></ul><ul><li>used to lift & move things </li></ul>
lever
wheel and axle <ul><li>ex: doorknob </li></ul><ul><li>wheel =knob </li></ul><ul><li>axle =post that attaches to its center...
wheel and axle
wheel and axle faucet handle
pulley <ul><li>changes the direction of motion to which a force is applied </li></ul>
pulley
Simple Machines Game <ul><li>Simple Machines game </li></ul><ul><li>http://staff.harrisonburg.k12.va.us/%7Emwampole/1-reso...
Simple Machines Activities <ul><li>http://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm </...
The 6 Simple Machines 1. Lever 3. Pulley 4. Wheel and Axle 6. Wedge 5. Screw 2. Inclined Plane
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3rd Grade-Ch. 12 Lesson 3 How do simple machines affect work

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

  1. 1. Ch. 12 Lesson 3 How do simple machines affect work?
  2. 2. work <ul><li>When a force moves an object </li></ul><ul><li>Not done when the position of an object does not change </li></ul>
  3. 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
  5. 6. When work is done Work Activity
  6. 7. Simple Machines <ul><li>help make work easier </li></ul><ul><li>don’t lessen amount of work </li></ul>
  7. 8. 6 kinds of
  8. 9. inclined plane <ul><li>slanting surface that connects a lower level to a higher level </li></ul>
  9. 10. inclined plane
  10. 12. wedge <ul><li>made up of 2 slanted sides that end in a sharp edge </li></ul><ul><li>used to split, cut or fasten things </li></ul>
  11. 13. wedge
  12. 14. screw <ul><li>inclined plane wrapped around a center post </li></ul><ul><li>used to hold things together & to raise & lower things </li></ul>
  13. 15. screw
  14. 16. lever <ul><li>stiff bar that rests on a support </li></ul><ul><li>used to lift & move things </li></ul>
  15. 17. lever
  16. 18. wheel and axle <ul><li>ex: doorknob </li></ul><ul><li>wheel =knob </li></ul><ul><li>axle =post that attaches to its center </li></ul>
  17. 19. wheel and axle
  18. 20. wheel and axle faucet handle
  19. 21. pulley <ul><li>changes the direction of motion to which a force is applied </li></ul>
  20. 22. pulley
  21. 23. Simple Machines Game <ul><li>Simple Machines game </li></ul><ul><li>http://staff.harrisonburg.k12.va.us/%7Emwampole/1-resources/simple-machines/index.html </li></ul><ul><li>http://sunshine.chpc.utah.edu/javalabs/java12/machine/index.htm </li></ul><ul><li>http://www.galaxy.net/~k12/machines/index.shtml </li></ul><ul><li>http://www.quia.com/pages/hostetterscience.html#simple </li></ul><ul><li>How can we move our principal game </li></ul>
  22. 24. Simple Machines Activities <ul><li>http://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm </li></ul><ul><li>http://www.mikids.com/Smachines.htm </li></ul><ul><li>http://teacher.scholastic.com/dirtrep/simple/index.htm </li></ul>
  23. 25. The 6 Simple Machines 1. Lever 3. Pulley 4. Wheel and Axle 6. Wedge 5. Screw 2. Inclined Plane
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