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a force applied to an object which experiences displacement, increasing or decreasing the energy of a system---requires force and displacement, is done to something or on something,is partially along that line (force does not have to cause displacement)---the product of force and displacement


the ability to do work

law of conservation of energy

all energy in the universe in constant and simply changes from one type to another

kinetic energy

the energy of motion (scalar)

work-energy theorem

the net work done on a system is equal to that system's change in kinetic energy


the rate at which work in done on a system

simple machine

can't be broken into parts, provide a mechanical advantage

mechanical advantage

the ratio of the output force to the input force

ideal mechanical advantage

the ratio of distance in to distance out


(e) the ratio of mechanical advantage to ideal mechanical advantage

potential energy

stored energy that we may at some time use to do work (may not be used in stored form)

gravitational potential energy

the energy stored in an object due to its position in a gravitational field

reference point

place on frame of reference with 0 potential energy

elastic potential energy

the amount of energy stored in a spring or other elastic material due to being deformed from its natural length

rest energy


mechanical energy

the energy of a system contained as kinetic or potential

conservation of mechanical energy

mechanical energy is only conserved when only gravity or elastic forces are doing work on the system

conservative forces

gravity and spring force---when the tension is non-existent or perpendicular to the displacement, it does not work

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