adam ciaccio
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| Work | occurs when a force causes an object to move in the direction of the force
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| Work is ONLY done when ………… | the force is in the same direction that the object is going
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| These 2 things must be present in order for work to be occurring | work and force
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| What is the work formula ? | W= F x D
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| What is the power formula? | P= W/T
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| Watt include picture(s) | The unit used to express power
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| Machine include picture(s) | a device that helps make work easier by changing the size or direction of a force
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| Work Input | the work you do on a machine
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| Work Output | The work done by the machine
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| When can work output be GREATER than work input? – it can never be greater. |
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| (carefully read last paragraph p. 193) |
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| “Machines don’t save work” . True or false? Explain your answer | False. The same work is done either way
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| Mechanical Advantage –tells you how many times the machine multiplies force |
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| Mechanical Advantage formula –MA= output force/input force |
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| What are the 6 simple machines ? | Lever, screw, wedge, pulley, wheel and axle, inclined plane
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| Lever –simple machine consisting of a bar that pivots at a fixed point |
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| Examples of include picture(s) | see saw, kayak, wheel barrow
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| Fulcrum –the point on a level where the bar pivots |
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| Examples of each of the 3 classes of levers | include picture(s)
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| Inclined Plane | simple machine that is a straight, slanted surface
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| How do you increase the mechanical advantage of an inclined plane? | the longer the inclined plane is compared with its height, the greater the mechanical advantage
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| Examples of Inclined Planes include picture(s) | a ramp
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| Wedge | a double inclined plane that moves.
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| Examples of Wedges include picture(s) | A knife
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| Screws | an inclined plane that is wrapped in a spiral
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| Examples Screws include picture(s) | jar lid, screw
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| How do you change the mechanical advantage of a screw? | the longer the inclined plane the higher the mechanical advantage
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| Wheel & Axle | a simple machine consisting of two circular objects of different sizes
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| Examples of Wheel & Axle include picture(s) | water pump
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| Pulley –a simple machine consisting of a grooved wheel that holds a rope or a cable |
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| Examples of Pulleys include picture(s) | Cable cars
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