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

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### Transcript

• 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