012-04840E
Dynamics Cart
6
®
Procedure
1. Place the cart in its starting position and then launch it. To cock the spring plunger, push the
plunger in, and then push the plunger upward slightly to allow one of the notches on the
plunger bar to “catch” on the edge of the small metal bar at the top of the hole. Using a
stopwatch and metric tape, determine the range
d
and the total time spent rolling
t
. Record
these in Table 2.1.
2. Repeat step 1 six times for each direction and enter your results in Table 2.1.
3. Using
EQN-3
, compute the accelerations corresponding to your data and an average accel-
eration for each of the two directions.
4. Using the results of step 3, determine
µ
r
and
θ
by solving for the two unknowns algebra-
ically.
Average Acceleration = __________
d (cm)
t (sec)
a ( )
Second Direction
Trial
1
5
4
3
2
6
cm
s
2
d (cm)
t (sec)
a ( )
First Direction
Trial
1
5
4
3
2
6
cm
s
2
Table 2.1
Data Analysis
Coefficient of rolling friction = ________________ Floor Angle = ________________
Questions
1. Can you think of another way to determine the acceleration of the cart? If you have time try
it!
2. How large is the effect of floor slope compared to that of rolling friction?
Average Acceleration = __________
s
2
cm
s
2
cm
Summary of Contents for ME-9430
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Page 17: ...012 04840E Dynamics Cart 13 Table 4 1 Trial 1 5 4 3 2 6 m kg 8 7 x meters F mg newtons...
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