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unit 2 energy


work the use of force to move a an object some distance in the direction of the force
power is the rate at which work is done.
energy the ability to do work
kinetic energy the energy of motion
potential energy is the energy an object has because of its positions
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 machines work output with the work input
lever a simple machine that has a bar that pivots at a fixed point.
fulcrum a 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 cable.
inclined plane a simple machine that is a straight, slanted surface
Created by: apetway