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# Physical Science

### Chapter 8 Test

Block and Tackle Multiple pulley system. Mechanical advantage for pulleys in a block and tackle = numbers of pulleys used
Compound Machine a device that combines two or more simple machines
First Class Lever Lever in which the fulcrum is in the middle
Fixed Pulley a pulley attached to something that does not move.
Fulcrum The fixed point around which a lever pivots
Ideal Machine machine in which work input equals work output; no friction; 100% efficiency
Input Force a unit of work equal to one newton-meter
Kinetic Energy the energy an object has due to its motion
Lever a rigid bar that is free to move around a fixed point
Machine Machine a device that makes work easier
Mechanical Advantage the number of times the force exerted on a machine is multiplied by the machine
Mechanical Efficiency a quantity, usually expressed as a percentage, that measures the ratio of work output to work input in a machine
Movable Pulley a pulley in which one end of the rope is fixed and the wheel is free to move
Output Force the force that is exerted by a machine
Power the rate at which work is done
Pulley a simple machine that consists of a rope that fits into a groove in a wheel
Radius The distance from the center of a circle to a point on the circle
Screw a simple machine that consists of an inclined plane wrapped around a cylinder 
Second Class Lever input force is between the fulcrum and the load
Watt unit for power
Wedge a V-shaped object whose sides are two inclined planes sloped toward each other 
Wheel and Axle a simple machine that has a center rod attached to a wheel
Work force exerted on an object that causes it to move
Work Input the work done "ON" a machine
Work Output work done "BY" the machine
Created by: bugattiboy