1
Newton’s Second Law
We are observing the motion of a 500g
cart when acted on by a rope attached to a
weight hanging off a pulley. Using a computer,
we will analyze the forces and acceleration of
the cart.
Exercise 1: Acceleration with a Varying Force and a Constant Mass
Experiment:
We set up the cart as shown in the above diagram. The computer took velocity
measurements as we increased the weight hanging from 10g to 60g in 10g increments.
The weight for the system was kept constant by placing the remaining weight on the cart.
Data:
The following is the recorded data from exercise 1.
Exercise 1
m
h
(kg)
a (m/s
2
)
error
F (N)
0.01
0.137
0.00087
0.098
0.02
0.304
0.00049
0.196
0.03
0.489
0.0007
0.294
0.04
0.643
0.00071
0.392
0.05
0.792
0.00091
0.49
0.06
0.968
0.0012
0.588
The force above was calculated by using the equation:
F = 9.8
m/s
2
x m
Ex: .098 N = 9.8
m/s
2
x .01 g
Upon graphing the force as a function of time, we get a linear association as
shown on the graph on page. A calculated trend line gives us the equation:
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 Fall '06
 Cerruti
 Physics, Acceleration, Force, Mass, 0.56 kg, 01 g, 1 Newton

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