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chapter 5
Question | Answer |
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work power | transfer of energy that occurs when a force makes an object move |
power | amount of work done in one second |
machine | is a device that makes doing work easier |
output force | force applied by the machine |
input force | the force that is applied to the machine |
efficiency | how much work put into a machine is changed into useful output work by the machine |
mechanical advantage | the ratio of the output force to the input force |
simple machine | machine that does work with only one movement lever pulley wheel and axle inclined plane screw and wedge |
lever | simple machine consisting of a bar free to pivot about a fixed point called the fulcrum |
pulley | simple machine that consists of a grooved wheel with a rope chain or cable running along the groove can be either fixed or movable |
wheel and axle | simple machine that consists of a shaft or axle attached to the center of a larger wheel so that the shaft and the wheel can rotate together |
inclined plane | simple machine that consists of a slopin surface such as a ramp that reduces the amount of force needed to lift something by increasing the distance over which the force is applied |
screw | simple machine that consists of an inclined plane wrapped in a spiral around a cylindrical post |
wedge | simple machine that is an inclined plane with one or two sloping sides |
compound machine | machine that is a combination of two or more simple machines |