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13 Cards in this Set
- Front
- Back
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What is work?
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when a force moves an object in the same direction as the force
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What is the formula for work?
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W = Force X Distance
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What is the unit for work?
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Joules or Nm (newton-meters)
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What is Power?
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The rate at which work is done.
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What is the formula for power?
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Power = work divided by time
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What is the unit for power?
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Watt
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How do machines help u do work?
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They allow u to apply a SMALLER FORCE over a LONGER DISTANCE.
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What is mechanical advantage?
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A # that tells u how many times a machine multiplies the effort force.
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What is the unit for mechanical advantage and mechanical efficiency?
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There is NONE
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Name the 6 types of simple machines.
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lever, inclined plans, wedge, screw, wheel and axle, pulley
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What is a compound machine?
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A machine made up of 2 or more simple machines.
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How does a fixed pulley change the input force.
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It changes the direction.
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Where is the best location for a fulcrum when using a lever?
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Close to the load. Will use the least amount of input effort.
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