The objective of this experiment is to measure a projectile using three different methods
and figure out which method is best.
Description:
This lab has two different methods that has a steel ball shooting out of a spring gun
horizontally. The ball can be shot off of the lab or into a pendulum where the velocity
will be able to be measured through the conservation laws associated with Newton’s 2
nd
law of nature. The third method involves finding the period
of the pendulum swinging to
calculate values of the initial speed v of the ball.
Theory:
The first part of this lab uses kinematics of the ball shooting out of the gun to find the
velocity using the equation v = D(gh)
1/2
.
The second and third part involves using the conservation of momentum and energy to
calculate to calculate the speed of the ball based on the height that the pendulum it shoots
into reaches. In the third part, the pendulum is assumed to be a mass less wire and the
period of the pendulum is calculated which can be used to solve for the final velocity
using the conservation of energy theorem. The calculations used are Final PE = initial
KE; (M +m)gh = ½ mv
2
; and
v = (M + m)/m(2gh)
1/2
.
Data:
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 Fall '08
 Adler
 Physics, Mass, Velocity, Vavg

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