PHYS 2101 Midterm: PHYS 2101 LSU 2006s f
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6 (gonz alez, tth 1:40pm: please be sure to write your name and circle your section above, for the problems, you must show all your work. No other reference material is allowed during the exam: good luck! A 180 g block is dropped from rest onto a relaxed vertical spring that has a spring constant of k = 300 n/m. The work done by the gravitational force fg = mg force is wg = Also, the work done by the gravitational force is minus the change in gravitational potential energy. The change in gravitational energy is negative, since the mass moves down a distance x: Wg = +0. 21j. (b) (4 pts) calculate work done on the block by the spring force from the time the block falls on the spring until the time the block momentarily stops. The work done by the spring force fs = kx force is ws = r |deltax.
