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Machines 4. Simple Machines

Machines 4. Simple Machines. Simple Machines. http://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm. There are thousands of different kinds of machines. You use machines every day.

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Machines 4. Simple Machines

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  1. Machines4. Simple Machines

  2. Simple Machines http://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles1/finalhome.htm

  3. There are thousands of different kinds of machines You use machines every day

  4. But did you know that all machines are based on only six (6) kinds of simple machines Vocabulary: Simple machines A device that makes work easier

  5. A lever is one type of simple machine Vocabulary: lever A rod that can turn on a point called a fulcrum

  6. Vocabulary: fulcrum A point on which a lever can turn

  7. If you push down on the end of one kind of lever The other end moves up

  8. You can lift things more easily because less force is needed

  9. There are three (3) basic kinds of levers They are different because each kind has the fulcrum in a different place

  10. First class lever: The fulcrum is between the load force and the effort force

  11. Second class lever: The load force is between the effort force and the fulcrum

  12. Third class lever: The effort force is between the fulcrum and the load force http://www.worsleyschool.net/science/files/lever/quiz.html

  13. An inclined plane is a flat surface that slopes Vocabulary: Inclined plane A flat surface that slopes

  14. A board from a low place to a high place is an inclined plane called a ramp

  15. Less force is needed to slide an object up a ramp than to lift the object

  16. A wedge can split a log more easily by hitting a wedge stuck in the log

  17. Vocabulary: wedge Two inclined planes that come together at a point

  18. A screw is an inclined plane wrapped around a rod Screws hold things together better than nails

  19. You can fasten an object to one end of the rope on a pulley If you pull the other end, you can lift the object

  20. Vocabulary: pulley A wheel with a rope around it and is used to lift objects

  21. 3 Basic Types of Pulleys: Fixed Pulley Mechanical Advantage is 1 If you are lifting 150 pounds you have to apply 150 pounds force

  22. Mechanical Advantage: Count number of rope sections NOTE: Subtract 1 if you have to pull down on rope 2 ropes pieces 1 you use to pull down to apply force Mechanical Advantage: 1

  23. Moveable Pulley Mechanical Advantage is 2 If you are lifting 150 pounds you have to apply 75 pounds force

  24. Combined Pulley Count number of rope pieces Subtract 1 since pulling down Mechanical Advantage is 2 If you are lifting 150 pounds you have to apply 75 pounds force

  25. Combined Pulley Count number of rope pieces Pulling up so it counts Mechanical Advantage is 3 If you are lifting 150 pounds you have to apply 50 pounds force

  26. Several pulleys can be joined together Count number of rope pieces Subtract 1 since pulling down Mechanical Advantage is 3 to make it easy to lift heavy objects

  27. Identify the mechanical advantage in each set of pulleys: MA ? MA ? MA ?

  28. A wheel and axle is really a kind of lever that continues to turn around its fulcrum

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