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Section 2 Simple Machines

Section 2 Simple Machines. I. Types of simple machines. Simple Machine -a machine that does work in one motion. There are six types of simple machines. B. Levers – bar that is free to turn about a fixed point. The fixed point is called a fulcrum. Resistance arm. Effort arm.

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Section 2 Simple Machines

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  1. Section 2 Simple Machines

  2. I. Types of simple machines Simple Machine-a machine that does work in one motion. There are six types of simple machines.

  3. B. Levers – bar that is free to turn about a fixed point. The fixed point is called a fulcrum Resistance arm Effort arm fulcrum Resistance Force

  4. 2. Three classes of levers:

  5. What Class? Third Class First Class Second Class

  6. C. Pulley – a grooved wheel with a rope, chain, or cable running along the groove. Fixed pulley-attached to a fixed object.

  7. D. Wheel and Axle – two wheels of different sizes that rotate together. usually the effort force is applied to the larger wheel.

  8. E. Inclined Plane – sloping surface that reduces the amount of force required to do work.

  9. F. Wedge – inclined plane with one or two sloping sides

  10. G. Screw – inclined plane wrapped in a spiral around a cylindrical post.

  11. Mechanical Advantages of Simple Machines

  12. II. Mechanical advantage (MA) A ratio of the output force and the input force MA greater than one =multiplying the input force 2. MA less than one = increase distance or speed.

  13. B. Lever Length of effort arm MA = Length of resistance arm Le MA = Lr

  14. C. Inclined Plane length of slope MA = height of slope l MA = h Effort distance MA = Resistance distance

  15. D. Pulley 1. Fixed pulley, MA = 1 E. Wheel & Axel Radius of wheel MA = Radius of axle rw MA = ra

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