Name and Discussion Section Number ________________________________________
ENSC 2123
Exam 2
Fall 2010
Question 1 (25 Points):
The 3kg collar slides along the smooth vertical spiral rod.
Determine the tangential force that must be propelling the collar and the normal force between
the road and the collar.
At
ߠ ൌ
గ
ଶ
radians:
ݎ ൌ 3.142
meters,
ݎ
ሶ ൌ 8
meters/s,
ݎ
ሷ ൌ 0
meters/s
2
,
ߠ
ሶ
ൌ 4
rad/s and is constant.

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Question 2 (25 Points):
Block A weighs 20 pounds, and block B weighs 5 pounds.
If block
B has an initial downward velocity of 3 feet per second, when
ݐ ൌ 0
seconds, determine the
distance block B must travel before it momentarily comes to a stop.
Note: you must use
ENERGY or MOMENTUM to solve this problem. You may NOT use chapter 13 methods.