Notes Physics Part 2
Notes Physics Part 2
Notes Physics Part 2
Momentum
equal to the change in momentum of the object.”
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Momentum = p = mv
Coefficient of Restitution
be stopped, it will take larger force to be applied and the time that
the force is applied should also be longer. The SI unit of impulse is
N-s. It is the negative ratio of the relative velocity between the objects
after collision to the relative velocity between the objects before
Impulse = Ft = mv = mv f − mv i collision. If the coefficient of restitution is 1, then the collision is
perfectly elastic. If the coefficient of restitution is 0, then the
collision is completely inelastic.
Newton's cradle is a device that
demonstrates conservation of
v 2A − v 2 B
momentum and energy using a series e=−
of swinging spheres. When one sphere v1A − v1B
at the end is lifted and released, it
strikes the stationary spheres,
transmitting a force through the Another way to get the coefficient of restitution is in terms of the
stationary spheres that pushes the initial height and the bounce height:
last sphere upward. The last sphere
h bounce
swings back and strikes the still nearly e=
stationary spheres, repeating the h initial
effect in the opposite direction. Excel Review Center