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Use the following information to answer question.
A student is conducting an experiment using a ball that is attached to the end of a string on a pendulum. The student pulls the ball back so that it is at an angle to its resting position. As the student releases the ball, it swings forward and backward. The student measures the time it takes the ball to make one complete period. A period is defined as the time it takes the ball to swing forward and back again to its starting position. This is repeated using different string lengths.
You must make the student locate an appropriate control variable for this experiment? It is the

A

The period

B

The length of the string

C

The mass of the ball

D

The color of the ball

Text Solution

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The correct Answer is:
C
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