Lab 10
Projectile Motion and Ballistic Pendulum
Objective
The equations describing the motion of a point object in two dimensions under the
influence of gravity can be used to analyze a projectile motion.
In this experiment the initial velocity of a projectile will be determined using two
different methods:
1. from the rangefall measurements;
2. from the momentum conservation law.
The results of these two methods will then be compared and the percent difference
will be calculated.
The difference, if any, should be carefully explained showing thoughtful analysis and
thorough thinking.
After performing the experiment and analyzing the data you will be able to:
1.
Explain the concept and use of conservation of energy and momentum and be
able to discriminate between them.
2.
Apply the independence of horizontal and vertical motions of a projectile to
solve problems.
3.
Evaluate the accuracy of two independent methods for measuring the initial
velocity of a projectile.
4.
Make inferences about the origin/cause of any difference in the calculated
initial velocity of the projectile;
5.
Analyze the methods and deduce how you can use the experiment to determine
the energy lost during collision in forms of heat.
6.
Write a comprehensive report on the method and results of the experiment.
Equipment:
A spring loaded gun and a metal ball, a ruler.
Theory:
1.
Determination of v
o
by horizontal Projectile
v
o
x
y
o
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View Full DocumentA projectile launched horizontally with an initial horizontal velocity
v
o
from a height
y
o
will move along a parabola. This horizontal velocity
v
o
will remain a constant
since there is no force on the projectile in the horizontal direction. The projectile will
travel a horizontal distance
x
with this uniform velocity
, called the range, while
falling a vertical distance
y
.
The horizontal range
x
, written as a function of time is:
x = v
o
t
……….(i)
The initial vertical velocity,
v
yo
is zero.
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 Fall '10
 George
 Physics, Energy, Gravity, Kinetic Energy, Potential Energy, Projectile Motion, Special Relativity, conversion factor

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