IPC Chpt 14
Work and Machines
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What is the product of the force applied on an object multiplied by the distance the object moved ? |
Work |
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What is a rigid bar capable of turing about a fixed point (fulcrum) |
Levers |
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What is an example of a 1st class lever? |
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What is an example of a 2nd class lever? |
Wheelbarrow |
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What is an example of a 3rd class lever? |
Shovel, biceps, muscles |
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What is a modified lever in which the effort arm and the resistance arm revolve around a central fulcrum? |
Wheel and axle (bike, fishing reel) |
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What is an inclined plane wound around a cylinder or cone? |
Screw |
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What is an slanted surface used to raise objects? |
inclined plane |
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Formula for mechanical advantage? |
MA=Length of inclined/ height |
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What is a one or two part device that makes work easier? |
Simple machine |
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What is the method for computing the amount of force exerted by levers with unequal arms? |
Law of Moments |
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Formula for the Law of moments? |
W1D1=W2D2 |
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What is a modified lever consisting of a rope that moves around a grooved wheel; can be movable or fixed? |
Pulley |
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Formula for mechanical advantage of pulley? |
MA=R (resistance)/ E (effort)= (d)(e) distance effort/ (d)(r) distance resistance |
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What is the amount of work done in a given period of time? |
Work and power |
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Formula for power? |
P= W (work)/ T (time) |
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What is the amount by which a machine magnifies effort (force). Used to calculate how much advantage machines gives you? |
Mechanical Advantge |
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What is the example for calculating Mechanical Advantage? |
MA= R/E= dE/dR |
