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BME 314 Fall 2010 Quiz Answer Key
Created by TAs: Eileen Dawson and Prinda Wanakule
Quiz 4: October 12, 2010
1. State the two mathematical (or physical) conditions that must hold true when a body is in static
equilibrium. (2)
In any direction, the sum of all forces must equal zero.
+1 point
In any direction, the sum of all moments must equal zero.
+1 point
2. In the examples discussed in class, which direction do the cells align when subjected to a
uniaxial stretch, along the direction of stretch or perpendicular to it? (1)
What component
(molecule) inside the cell is responsible for this alignment? (1)
Perpendicular
+1 point
Actin (cytoskeleton is ok)
+1 point
3. For the following free body diagram write the moment equation at equilibrium with respect to
point X. (2)
Define a rotational positive/negative convention, ex: clockwise is positive; counterclockwise is positive
+0.25 points
Depending on their convention, they could have either:
F1*d1  F2*D2  F3*D3 = 0 (or = sum of moments)
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 Fall '08
 Frey
 Biomedical Engineering

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