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Work – force exerted over a distance

Work – force exerted over a distance. Force Distance Energy. # 62. Spring scale – used for finding force in Newtons (N). Measurement Mass Gravity. # 63. simple machine – allows a smaller force with a larger distance. Lever Pulley Inclined plane Wedge Screw Wheel and axle. # 64.

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Work – force exerted over a distance

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  1. Work– force exerted over a distance • Force • Distance • Energy # 62

  2. Spring scale – used for finding force in Newtons (N) • Measurement • Mass • Gravity # 63

  3. simple machine – allows a smaller force with a larger distance • Lever • Pulley • Inclined plane • Wedge • Screw • Wheel and axle # 64

  4. Effort – force used on a machine to make work Push or pull Mass Force # 65

  5. lever – a bar that balances on a fixed point • Tools • Crow bar • Tweezers • Fulcrum # 66

  6. fulcrum – the point where the lever balances • Pivot • Change location • Doesn’t move # 67

  7. pulley – a rope wrapped around a grooved wheel • Fixed • Movable • Blinds # 68

  8. Block and Tackle - a combination of 2 or more pulleys • Weight machine • Crane • More pulleys = less effort # 69

  9. inclined plane – sloping surface used to raise objects, doesn’t move Less Force Ramp Lift # 70

  10. wedge – inclined plane with 1 or 2 sloping sides Moves Nail Knife # 71

  11. screw – inclined plane wrapped around a cylinder • More distance, less force • Bolt • Jar lid # 72

  12. Wheel and axle – 2 circular objects, a shaft (axle) in the middle of a wheel • Door knobs • Steering wheels • Screwdrivers • Gears • Bicycle wheels # 73

  13. Complex or compound machines– 2 or more simple machines Scissors Fishing pole Bicycle # 74

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