HW04
General Notes
: Dynamic analyses are based upon FBDs; thus, all situations and calculations involving forces
require FBDs as discussed in class. FBDs will form a portion of the required points for all problems of this type
through the end of the semester
, regardless of whether they are specified in the problem statement.
1. Wolfson, Ch. 4 #45. Use the problem situation (changing 12N to 15N) and calculate all normal forces on all
blocks and the system acceleration.
2
. Wolfson, Ch. 4 #53. Change 4300kg to 4900kg. f) Moving forward with constant speed.
Many students wonder why Dr. Hasty makes such a big deal about coordinate systems and their utility. To
illustrate the importance of (and rationale for) selecting ‘efficient’ coordinate systems, consider a simple
situation: a 11kg crate slides from rest without friction 9.5m down a ramp inclined 12.5° below horizontal. In
the two cases below, the same calculations will be performed using different coordinate systems. Place the
coordinate origin upon the crate as it begins moving.
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 Spring '08
 Nandi
 Force, Velocity, Coordinate system, 2.5m/s, 9.5m, 11kg, 12.5°

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