Question

2. Suppose a spring is attached to the bob while it rotates. Assume the bob rotates at a period& that is sufficient to allow the cord to hang vertically as shown in the figure a) Draw a free-body diagram for the bob. What is the direction of the bob's acceleration and the net force acting on the bob? b) In terms of m, r. & determine the force that the spring exerts on the bob while it is rotating as shown in the above figure. What force acts on the spring that causes it to be pulled outward? c) Rotate the platform so that the bob hangs vertically and measure the period of rotation. From this period predict the force that the spring exerts on the bob while it is rotating. Be sure to estimate the uncertainty of your prediction for the force by using the experimental uncertainty for the measured period d) Using a spring scale (obtain one that will yield maximum deflection) stretch the spring to the same extent it was stretched while it was attached to the rotating bob. What force does the spring exert when it is stretched by this amount? How does this force compare with the force you found in part (c)? Is the force within your uncertainties?

Answer 1

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