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Physics 210: section 1
Projectile Motion
The purpose of this lab was to measure the effects of gravity on an object
traveling at a certain velocity.
To do this, two experiments utilizing glass tubes, a steel
ball and carbon paper were used.
The first experiment was conducted using a glass tube
approximately 1.5m long.
At one end, the tube is elevated in order for the ball to
establish a certain velocity (
v
).
The other end of the tube is open, this allows the ball to
leave the tube at some velocity and be exposed to the effects of gravity (
g
).
Initially we measured the height (
h
) of the opening of the tube where the ball
would exit from.
We then marked off a 1m section of the tube.
During trial runs, this 1m
section will be used to calculate the velocity of the ball traveling through the tube.
The
trial of dropping the ball into the tube and measuring the time (
t
) it took to travel 1m was
done 5 times.
An average of the five times was taken and used in the calculation of the
velocity.
All calculations are shown below.
h
= height of the tube opening = 78.5cm
t
= time
s = seconds
[
t
1
= 0.78s
+
t
2
= 0.75s
+
t
3
= 0.72s
+
t
4
= 0.70s
+
t
5
= 0.74s]
=
t
av
= 0.74
s
5 trials total
Knowing the average time it takes the ball to travel 1m horizontally and the
distance it traveled in that time, we can calculate the velocity using the equation
x
=
v
i
t
where:
x
= disposition
v
i
= initial velocity
t
= time
The initial equation change around to solve for
v
looks like this:
v
=
d/t
v
= 1m/0.74s = 1.35 =
1.4m/s
The next step is to use the height (
h
) and the horizontal speed (
v
i
) to determine
how far horizontally the ball will travel before it reaches the ground.
This distance, from
the opening of the tube to the point of impact on the ground, is known as the range (
R
).
To find this value we use the equation
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 Spring '08
 Marshland
 Physics, Gravity, Projectile Motion

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