Ballistic FP Prediction question: (Swing of the pendulum) (a) Should swings 3. h

Question

Ballistic FP Prediction question: (Swing of the pendulum) (a) Should swings 3. horizontal momentum of the ball plus pendulum be conserved while the pendulum up to the maximum height? (b) If so, why? If not, why not? (c) Should mechanical energy (PE+KE) be conserved during the swing? (d) If so, why? If not, why not? 4. Prediction question: Thus putting together the two previous results, show that 112 5. Method question: Recalling that the center of mass would be a balance point, explain how you could find the center of mass of the ball plus pendulum in the laboratory by unscrewing the assembly from the frame and balancing it on a sharp edge--for example of a ruler. How will this measurement be important in your theory, based on the questions above? 11-4

Explanation / Answer

3] a] No

b] Because there is an external force tension which also has a horizontal component.

c] Yes.

d] Because there is not any non-conservative force like friction acting.

4] By momentum conservation at the instant mass got removed

mv = (m+M)u where u = sqrt (2gh) by energy conservation

v =  (m+M)u/m

v =  (m+M) sqrt (2gh)/m

5] more data is required

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