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Friction
friction
force that acts to resist the relative motion (or attempted motion) of objects or materials
that are in contact
mass
the quantity of matter in an object; the measure of the inertia or sluggishness that an object
exhibits in when something tries to change it
weight
usually the force upon an object due to gravity
kilogram
a mass unit
newton
the unit of force in metric units, which is equal to a little less than a quarter-pound (like the
weight of a quarter-pound cooked hamburger
volume
an object's size; not a good indication of an object's mass