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4. What are some sources of uncertainty associated with the ballistic pendulum apparatus that we are using?
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Answer #1

Part of the momentum of the impact will be transmitted to the pendulum frame through imperceptible flexing and energy will be lost through windage and bearing friction. To correct for these factors, remove the spring gun by removing 2 wing screws on the bottom. Position the stop bar to allow the pendulum to be consistently and accurately located at a selected angle to the right. Pull the pendulum back to this position, measure with the indicator and release the pendulum. Ideally, the pendulum will swing as far left as it was released right. The observed difference is due to the above-mentioned error.

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