MOMENTUM
AND
IMPLUSE
MOMENTUM
Momentum is the amount of convenience of an object or a system in
motion. It is the approximate product of an object's mass and velocity,
and is often represented as p = mv. p is the momentum,m is the mass,
and v is the velocity
EXAMPLE
if the baseball has a mass of 0.145 kg and is thrown with an initial
velocity of 30 m/s, we can calculate its momentum as follows:
if a car with a mass of 1000 kg is traveling at a velocity of 20 m/s, we
can calculate its momentum as:
IMPLUSE
Impulse is the change in momentum of an object due to the presence
of forces that strike or act within a certain period of time. Specially the
change in momentum of a system is equal to the impulse of the force it
experience. The approximate product of forces and time, and is often
represented as I = Ft, where I is the impulse, F is the force, and t is the
time of application of the force.
IMPULSE-MOMENTUM
THEOREM
The theorem states that the impulse applied to an object is equal to
the change in momentum of that object. The unit of ImpulseMomentum Theorem is Ft = mv - mv0
EXAMPLE
soccer player kicks a ball, applying a force of F=50N to the ball for a
duration of t=0.2s. We want to calculate the impulse applied to the ball.
EXAMPLE
A force of 56 N acts on a 25 kg body for 12 s. Find the (a) impluse
produce by the force, (b) resulting change in momentum of the body,
and (c) speed of the body at the end of 12 s. Assume that body start
form rest.