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Physics211L Pre-‐Lab for the Atwood’s Machine
Read the Atwood’s Machine write-‐up in the lab manual. Answer these questions
either on a print-‐out of this sheet or on a separate sheet of paper. Bring your
answers to class on lab day. I will initial them and grade them 0/0.5/1 based on
whether they are complete and correct. Neatly staple them into your lab notebook
with the correct lab entry.
1. The Atwood machine consists of two massive objects hung over a (low-‐
friction, low-‐mass_ pulley. One of the objects is more massive and the other
is less massive. For the atwood machine experiment which is most important
for determining the acceleration of the two masses? Explain why.
a. The mass of the heavier object
b. The mass of the lighter object
c. The total mass of both objects together
d. The difference of the two masses
2. Why do you think the instructions tell you to shift mass from one side to the
other instead of just adding mass to one side?
3. Write down an equation that we could use to get the fractional uncertainty
in g, having used equations 5 and 7 in your lab manual to calculate g from
raw data.
4. What will be the dominant source of error in your measurement of the fall
time? Do you have a good way to estimate a numerical value for this
uncertainty?
5. We frequently treat pulleys as massless. If we could not treat this one as
massless do you think that would increase or decrease our values for g? (No
penalty for wrong answers if you explain your reasoning)
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