Momentum and Collisions
Momentum:Momemtum may be described as inertia in
motion. It is the product of mass times velocity. P = mv
Impulse: A change in the momentum of an object. It is the
product of force times time. J=Ft The impulse may occur over a long
or short time period, and with a large or small force applied to
make the change in momentum.
Conservation of momentum: Momentum isn�t created or
destroyed in a given system. It may be transferred from one object
to another. Only an outside or external force will change the total
momentum.
- When comparing a bouncing collision to a collision where an
object is brought to a halt, the bouncing object experiences a
much larger impulse.
- A hit and stick collision is when one object impacts
another, then they stay as one.
- A hit and rebound collision is when one object hits another
and they both remain separate.
- An explosion collision is when an object breaks apart. It
may not necessarily be an explosion.
Elastic collision: An elastic collision is one where:
- Momentum is conserved.
- The objects colliding aren�t deformed or smashed
- Thus no kinetic energy is lost; kinetic energy is conserved
also.
- Ex: billiard ball collisions
Inelastic collisions: An inelastic collsion is one where:
- Momentum is still conserved, but kinetic energy is lost.
- The lost kinetic energy will be transformed into other
types.
- The objects often interlock and stick together, they may
also be deformed and mangled.
- Ex: car crash
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