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Michael Strickland
Physics 111 lab
October 26 2010
Kileigh Peturis
Activity 9
Conservation of Linear Momentum
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View Full DocumentIntroduction
Conservation laws refer to physical quantities that remain constant throughout the
multitude of processes which occur in nature. If these physical quantities are carefully measured,
and if all known sources are taken into account, they will always yield the same result. The
validity of the conservation laws is tested through experiments. However, many of the
conservation laws are suggested from theoretical considerations. The conservation laws include:
the conservation of linear momentum, the conservation of angular momentum, the conservation
of energy and mass, and the conservation of electric charge. In addition, there are many
conservation laws that deal with subatomic particles, that is, particles that are smaller than the
atom. Momentum is of two kinds, angular and linear.
Both kinds are conserved in any collision.
Conservation means that none is lost.
Linear momentum is the tendency of an object moving in
a certain direction to keep going at the same speed in the same direction.
It is the product of the
object's inertia (its mass M) and its velocity (v), or (Mv). Conservation of Linear Momentum, as
applied to the collision of a tennis racquet with a ball, works like this. Because of the
conservation principle, we can write a before and after equation, setting the sum of momenta of
the racquet and ball before the collision equal to the sum of momenta after the collision.
The
racquet's momentum is the product of its mass (M) and the linear velocity of its mass center (v).
The ball's momentum is the product of its mass (b) and its linear velocity (s).
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 Spring '10
 sirola
 Momentum

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