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ch8 voc
Question | Answer |
---|---|
work | The transfer of energy to an object by using a force that causes the object to move in the direction of the force. |
joule | The unit used to express energy. |
power | The rate at which energy is transfered. |
watt | The unit used to express power. |
machine | A device that makes work easier by changing the size or direction of a force. |
work input | The work done on a machine. |
work output | The work done by a machine. |
mechanical advantage | A number that tells how many times a machine multiplies force. |
mechanical efficiency | A comparison of a macheines's work output with the work input. |
lever | A simple machine that consists of a bar that pivots at a fixed point called a fulcrum. |
pully | A simple machine that consists of a wheel over which a rope chain or wire passes. |
wheel and axle | A simple macheine consisting of two circular objects of different sizes. |
inclined plain | A simple machine that is a straight, slanted surface. |
wedge | A pair of inclined plains that move. |
screw | A simple machine that consists of an inclined plain wrapped arouned a cylinder. |
compound machine | A machine made of more than one simple machine. |