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15 terms

work

The use of force to move an object some distance in the direction of the force.

equation for work

W = F x d

work = force x distance

work = force x distance

energy

is the ability to do work

power

is the rate at which work is done

equation for power

P = E/ t

power = energy divided by time

power = energy divided by time

joule

standard unit of measurement for both work and energy

watt

is the standard unit of measurement for power

potential energy

is the energy an object has because of its position, condition or chemical composition

kinetic energy

is the energy of motion

equation for kinetic energy

KE = 1/2mv2

kinetic energy = 1/2 mass x velocity squared

kinetic energy = 1/2 mass x velocity squared

elastic potential energy

is stored in a stretched spring or rubber band

chemical potential energy

a substance stores energy as a result of its chemical bonds

gravitational potential energy

is due to its position above the ground

machine

any device that helps people do work

six types of simple machines

levers, wheels and axles, pulleys, inclined planes, wedges and screws