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19 Cards in this Set
- Front
- Back
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efficiency
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can be calculated by comparing a machine's output work to its input work
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machine
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a device that changes the magnitude or the direction of a force
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compound machine
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consists of two or more simple machinces linked so that the resistance force of one machine becomes the effort force of the second machine
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resistance force
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the force exerted by a machine
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Watt
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a unit of power defined as 1 joule per second
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effort force
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the force exerted by a person on a machine
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work-energy therom
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states that the work done on an object equals the change in kinetic energy of the object
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energy
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the ability of an object to produce a change in itself or its surroundings
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kinetic energy
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the energy that results from the motion of an object
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power
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the rate of doing work
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mechanical advantage
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the ratio of the resistance force of a machine to its effort force
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joule
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the SI unit used for work
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ideal mechanical advantage
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comparison of a machine's effort distance to the resistance distance
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work
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calculated by multiplying an applied force by the distance through which the force is applied
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six simple machines
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lever, wheel & axle, pulley, inclined plane, screw, wedge
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3 majors parts of a lever
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fulcrum - pivot point
resistance - load to be lifted effort - the force used |
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1st class lever
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the fulcrum is the center with resistance and effort at the ends
ex. crowbar, scissors |
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2nd class lever
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the resistance is in the middle with the fulcrum and effort at the ends
ex. wheelbarrow |
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3rd class lever
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the effort is in the middle with the fulcrum and resistacne at the ends
ex. fishing rod |
