AP Physics Experiment – Projectile Motion (Kinematics in Two Dimensions)
Purpose
To determine the range of a projectile of known initial velocity and elevation
Procedures
Part I
1.
Check that the platform is level (parallel to the horizontal at 0
o
). Measure and
record the vertical distance (y) in meters from the sphere to the ground using a
meter stick along
a plumb line.
2.
Load the sphere and compress the spring until the trigger locks securely.
3.
Release the trigger and note the sphere's impact point. Affix sheet(s) of paper to
the floor overlaid with carbon paper at that point.
4.
Reload sphere and release trigger mechanism. Repeat at least 5 times.
Measure and record the mean
horizontal
distance (meters) from the plumb line to
the point of sphere impact (range) [R].
5.
Calculate the time (t) of flight n seconds for the sphere using the equation t=√(2y/
g) where g=9.8m/s
2
.
6.
Calculate the initial velocity from the equation v
o
=R√(g/2y).
7.
Calculate the angle of depression θ
d
to determine the
line of sight (LOS)
using
the equation θ
d
= tan
1
[(1/v
o
) √(gy/2)].
8.
Adjust, measure, &
record an elevation
angle θ of 45
o
.
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 Spring '08
 Jelena
 Physics, Projectile Motion, Trajectory, Velocity, plumb line

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