mfe chapter 4- work and machines
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| In scientific terms, when do you do work? | when the object moves in the same direction in which the force is exerted
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| In order for you to do work on an object, the object must move some _____________ as a result of your force. | distance
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| The amount of work you do depends on both the amount of _____ you exert and the _________ the object moves | force, distance
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| What formula do you use to determine the amount of work done on an object? | work= force x distance
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| What is the SI unit of work? | joule
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| What is the amount of work you do when you exert a force of 1 newton to move an object a distance of 1 meter? | 1 joule
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| What is the rate at which work is done? | power
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| T or F: You exert more power when you run up a flight of stair than when you walk up the stairs. | true
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| What is the formula you use to calculate power? | power= work/time
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| What is the longer way to write the formula for power? | power= force x distance/time
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| What are the six basic kinds of simple machines? | inclined plane, wedge, screw, lever, wheel and axle, and pulley
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| WSM: A simple machines that consists of a sloping surface connecting a lower elevation to a higher elevation | inclined plane
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| The larger the incline, the less __________ you need to push or pull an object on an inclined plane. | input force
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| WSM: a simple machines that consists of two inclined planes, giving it a thing end and thick end. | wedge
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| T or F: In a wedge, the inclined plane itself moves. | true
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| T or F: The longer and thinner a wedge is, the greater its mechanical advantage. | true
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| WSM: a simple machine that consists of an inclined plane wrapped around a central cylinder. | screw
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| A spiral inclined plane forms the __________ of a screw. | threads
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| WSM: A simple machine consisting of a bar that rotates around a fixed point. | lever
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| The fixed point that a lever pivots around is called the _____ | fulcrum
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| What type of lever is a door, wheelbarrow, and bottle opener? | second class
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| What type of lever is a seesaw, scissors, and pliers? | first class
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| What type of lever is a baseball bat, shovel, and fishing pole? | third class
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| WSM: A simple machine that consists of two connected rings or cylinders, one inside the other | wheel and axle
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| WSM: a simple machine that consists of a rope and grooved wheel | pulley
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| What is a machine that utilizes two or more simple machines? | compound machines
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