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Ch. 12 Work Review

Work Force times distance. Measured in Joules (J).
Power How quickly work gets done. Measured in Watts (W)
Horsepower Measure of the power output for car engines.
Machine Makes work easier.
How Machines Make Work Easier Change force, distance, or direction of effort force.
Input Force The force you put into the machine; sometimes called the effort force.
Output Force The force that comes out of the machine.
Mechanical Advantage A number that tells you how much easier a machine makes your work. Has no units.
Inclined Plane A flat, slanted surface. Stairs or a ramp are examples.
Wedge Tapers to a thin edge. Used for cutting. An axe or a knife are examples.
Screw An inclined plane wrapped around a cylinder.
Lever A rigid bar that rotates around fixed point (fulcrum). A door and a crowbar are examples.
Wheel and Axle Two cylinders connected by a common axis.
Pulley A grooved wheel with a rope around it.
Fulcrum The fixed point that a lever rotates around.
Compound Machine Made of two or more simple machines. A bicycle and a wheelbarrow are examples.
Efficiency Tells you how good a machine is at converting input work into output work. Expressed as a percentage.
Friction Reduces the efficiency of machines.
Created by: Mr.O'Brien