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2 factors - determines amount of friction
roughness of the surfaces (makes sliding difficult)
how amouont of force used to push the 2 objects together
Law of inertia
an object at rest tends to stay at rest,
and an object oin constant motion tends to stay in motion,
unless acted upon by an unbalanced force.
effect is offset by other forces, so motion won't change;
often point in opposite directions and always add up to zero
object's acceleration decreases
as its mass increases if the force applied to the object remains the same
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