PreLab exp4a10

PreLab exp4a10 - paintball and bob could not be conserved...

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1 Name ________________________ lab section ______________ Pre-Lab Questionnaire Experiment 4 Fall 2010 1 ! Define the paintball plus pendulum bob as a system at the instant that the paintball collides with the bob. Do any external forces act on this system? Illustrate your answer using a free body diagram. 2 ! Will momentum be conserved during the collision? Is any approximation involved? Explain. 3 ! Will momentum to be conserved while the pendulum is swinging? Explain. 4 ! Since the velocity and therefore the momentum of the pendulum and ball are zero at the height h, how can we say that momentum is conserved in the experiment? Explain.
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2 5 ! Comment in a couple of lines upon the following statement: “The momentum of the
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Unformatted text preview: paintball and bob could not be conserved in this experiment because of the large frictional forces between the bob and the entering paintball. 6 ! What percentage error is produced in v pend by using the approximate relationship for h obtained from the binomial expansion? Explain. See pages 3 and 4 of the lab handout. 7 ! Does using the approximation increase or decrease the calculated value of v pend ? 8 ! Combine Equations [2], [5] and [7] in the lab handout to obtain a single expression for the velocity of the paintball, v ball , in terms of d , L , g , m ball and m pend ....
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PreLab exp4a10 - paintball and bob could not be conserved...

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