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A cylinder is hung from a spring that is attached to a frame
as shown in the figure at the right. Use the coordinate system
with an origin ( The cylinder is pulled downward a very small amount and released.
At the instant the cylinder passes its equilibrium position for the first time,
a clock is started ( a) On the axes below, sketch a graph of the velocity of the mass
vs. time, |

b) Write an equation that gives *y * as a function of time corresponding
the *v*_{y} vs. *t* graph you sketched above.

c) At the instant of time when the cylinder is passing its equilibrium position, what forces are acting on the cylinder and in what directions do they act? If there is more than one, indicate their relative magnitudes.

Page last modified April 19, 2008: O39