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# Unit 2 Lessons 1-3

### Work Energy Machines

Work the use of force to move an object and move it
Energy the ability to do work
Power the rate at which work is done
Kinetic Energy the energy of motion
Potential Energy the energy an object has because of its position
Mechanical Energy the energy possessed by an object due to its motion and position
Machine any device that helps people do work by changing the way work is done
Mechanical Advantage the number of times the machine multiplies the input force
Mechanical Efficiency a comparison of a machine's work output with the work input
Lever a simple machine that has a bar that pivots at a fixed point
Fulcrum the fixed point
Wheel and Axle a simple machine that is made of a wheel connected to a smaller cylindrical object, the axle
Pulley a simple machine that has a grooved wheel that holds a rope or a cable
Inclined Plane a simple machine that is a straight, slanted surface
Created by: 18rliu1008
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