a force that opposes motion between two surfaces that are touching

an object's change in position relative to a reference point over period of time

the smallest particle into which an element can be divided and still be the same substance

an arrangement of the elements according to their atomic numbers

a push or a pull;

the rate at which velocity changes; (speed, direction or both)

subatomic particle inside the nucleus of an atom with a positive charge

the rate at which an object moves

subatomic particle inside the nucleus of an atom that has no charge or neutral

the SI (metric)unit of force

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