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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
law of conservation of energy
all energy in the universe in constant and simply changes from one type to another
the net work done on a system is equal to that system's change in kinetic 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
elastic potential energy
the amount of energy stored in a spring or other elastic material due to being deformed from its natural length
conservation of mechanical energy
mechanical energy is only conserved when only gravity or elastic forces are doing work on the system
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