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IGHS Winkels
Physical Science Chapter 14
Term | Definition |
---|---|
Work | the product of force and distance Work=force x distance |
Joule | is the SI unit of work |
Power | the rate of doing work Power = Work/Time |
Watt | the SI unit of power which is equal to one joule per second |
Horsepower | one hp is equal to about 746 watts |
Machine | is a device that changes a force |
Input force | the force exerted on a machine |
Input distance | the distance the input force acts acts through |
Work input | the work done by the input force acting through the input distance |
Output force | the force that is exerted by a machine |
Output distance | the distance the output force is exerted through |
Work output | of a machine is the output force multiplied by the output distance |
Mechanical Advantage | of a machine is the number of times that the machine increases an input force |
Actual Mechanical Advantage | AMA=Output force/Input force |
Ideal Mechanical Advantage | the mechanical advantage in the absence of friction IMA=Input distance/Output distance |
Efficiency | the percentage of the work input that becomes work output E=Work output/Work input x 100% |
Lever | a rigid bar that is free to move around a fixed point |
Wheel and axle | simple machine that consists of two disks or cylinders, each one with a different radius |
Inclined plane | a slanted surface along which a force moves an object to a different elevation |
Wedge | V-shaped object whose sides are two inclined planes sloped toward each other |
Screw | an inclined plane wrapped around a cylinder |
Pulley | a simple machine that consists of a rope that fits into a groove in a wheel |
Compound machine | a combination of two or more simple machines that operate together |
Fulcrum | the fixed point the bar rotates around (lever) |
Input arm | (of a lever) the distance between the input force and the fulcrum |
Output arm | (of a lever) the distance between the output force and the fulcrum |