Author Question: Why must the string held in the student's hand be pulled at a uniform ... (Read 99 times)

Yi-Chen · **on:** Jul 28, 2018

Why must the string held in the student's hand be pulled at a uniform rate?

Question 2

How did F c change when you redid the experiment using the larger mass? Did you expect this? Why or why not?

annierak · **Reply #1 on:** Jul 28, 2018

Answer to Question 1

For the mass on the plumb bob to pass directly above the masking tape marker on
each rotation its angular velocity must be constant and this can only happen if the
string is pulled at a uniform rate.

Answer to Question 2

The centripetal force increases with an increase in mass. This is expected, because
the centripetal force is directly proportional to the mass as shown in Eq. 8.2 in the
Laboratory Guide.