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Unformatted text preview: PROBLEM SET 4: Due next Weds. 09/30/09 before class Problems: 7.40, 8.41, 8.60, and the following: Consider an object of mass m = 1 kg attached to a spring of spring constant k = 1 N/m as shown. The object slides with a coefficient of kinetic friction μK = 0.1 and a coefficient of static friction μS = 0.2. Sketch its motion (plot x vs. t) when the object is displaced by an amount A from the spring’s equilibrium and released for the following cases: a) A = 1 meter b) A = 3 meters c) A = 5 meters In each case (i.e., for a, b, and c) you must find all the locations at which the object stops. This will include the occasions at which it changes direction and then continues moving and also the occasion at which the object finally comes to rest. You do not need to find the exact form of x(t) when the object is actually moving, just the locations where it stops Hint: Remember to use μK when the object is moving but μS any time it stops! Hint: To simplify the algebra, you may use g = 10 m/s2. Hint: Work out the problem algebraically as far as you can, and only then plug in numbers. k
m μK, μs ...
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This document was uploaded on 10/25/2011 for the course CHEM 118 at Yale.
- Fall '08