| When we release an object swung
in a circular path, it takes a net force (the resultant of all forces) acting inward that
keeps the object spinning in a circle; if you let go, the net force is no longer inward,
so the object flies outward. For example, If
a car travelling around a level curve. Where does the net force acting toward the
center of the curve come from? Static friction. So Newton's 2nd law for this
situation is determined as follows:
 F =
ma
and, static friction, assuming car is not
skidding
Ff =  FN
= mg
Centripetal acceleration:
ac = v2/r
In this situation,
Ff = F
mg = ma = mac
= mv2/r
Therefore:
g = v2/r
As a result, we see that the greater the of the road is, the faster a
car can travel without skidding. And the car can travel in a small radius of a curve
without skidding.
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