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Unit 2 ls. 1-3


work is the use of force to move an object some distance in the direction of the force.
energy is the ability to do work.
power is the rate at which work is done.
kinetic energy is the energy of motion.
potential energy is the energy an object has because of its position or condition or chemical composition.
mechanical energy is the energy possessed by an object due to its motioin and position.
machine is any device that helps people do work by changeing the way work is done.
mechanical advantage is the number of times the machine multiples the input force.
mechanical efficiency is a comparison of machines work output with the work input.
lever is a simple machine that has a bar that piviots at a fixed point.
fulcrum levers are used to apply a force to move an object.
wheel and axle is a simple machine that is made of a wheel connected to a smaller cylinder object the axel.
pulley is a simple machine that has a grooved wheel that holds a rope or a cable.
inclined plane is a simple machine that is straight.
Created by: 18esmith0528