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18 terms

Physics Ch. 10 Vocabulary

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work
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
energy
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
power
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
efficiency
(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
e=mc^2
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