Crane Stability & Rotational Overturning - Laboratory Worksheet

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Team Partners ____________________________________

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Variables:
 P = Load (number of pennies) d = Actual Distance from the rotation point to the counter balance weight D = Total Distance (1d, 2d or 3d) M = Moment = P x D or P(cal.) x D P(actual) = Actual Load Measured P(calc.) = Calculated Load/Counterweight Approx. Bridge Weight = P(calc.) - P(actual)
Note: If the Crane tips before adding a load then a counter weight must be used to balance the system.

Data Table 1:
 D P M D P(actual) P(calc.) Crane Arm - Weight X Counter Balance - Weight X d 20 . X d . . d 40 . X d . . d 60 . X d . . 2d 20 . X d . . 2d 40 . X d . . 2d 60 . X d . . 3d 20 . X d . . 3d 40 . X d . . 3d 60 . X d . .

Questions:

1. Does it make a difference how high off the ground the counterweight is?
2. Where is the best place on a crane to put a counterweight? Please be specific.
3. Based on the results of this test, how will this concept influence your design? Please explain.