# Damped harmonic motion

This problem is an example of critically damped harmonic motion.

A hollow steel ball weighing 4 pounds (mass = 1/8 slugs) is suspended from a spring. This stretches the spring 1/8 feet. The ball is started in motion from the equilibrium position with a downward velocity of 8 feet per second. The air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in feet per second) . Suppose that after t seconds the ball is y feet below its rest position. Find y in terms of t.

Take as the gravitational acceleration 32 feet per second per second. (Note that the positive y direction is down in this problem.)

When using English units (lb, ft, etc.) you need to be a bit careful with equations involving mass. Pounds (lb) is a unit of force, not mass. Using mg=F and g=32 ft/sec^2 we see that if an object weights L pounds it will have a mass of L/32 lb*sec^2/ft (or slugs).

Â© BrainMass Inc. brainmass.com March 4, 2021, 6:05 pm ad1c9bdddfhttps://brainmass.com/math/calculus-and-analysis/damped-harmonic-motion-27908

#### Solution Summary

This is a problem regarding damped harmonic motion of a steel ball.