1
OBJECTIVE
To calculate the range of a projectile that is launched horizontally by a ballistic pendulum
by applying Conservation of Energy and Conservation of Momentum.
EQUIPMENT
1.
ballistic pendulum
2.
carbon paper
3.
tape
4.
meter stick
5.
pan balance
THEORY
Figure 1
The apparatus shown in Figure 1 is called the ballistic pendulum. This device is used to
determine the speed of fast moving projectiles.
The projectile is launched horizontally
into a pendulum and then swing together until they reach a maximum vertical height ‘h’.
Conservation of momentum and energy can then be applied to measure the initial speed
of the projectile.
1.
You will apply conservation of momentum to the ball + pendulum system
immediately after the ball is fired and immediately after the pendulum catches the
ball.
By equating the initial momentum to the final momentum for this complete
inelastic collision you will have an expression for the velocity of the ball
immediately before the collision.
The velocity of the ball V
b
immediately before
the collision will be in terms of the velocity V of the ball + pendulum system
The Ballistic Pendulum
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immediately after the collision, the mass m
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 Fall '09
 Luna
 Conservation Of Energy, Energy, Mass, Momentum, ball, Conservation of Energy and Conservation of Momentum

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