Rec04_172Fall11

# Rec04_172Fall11 - Physics 172 Recitation 04 Fall 2011 As...

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Physics 172 – Recitation 04 Fall 2011 As you work on today’s problems remember that every time you use a fundamental principle you must explain clearly what physical system you are applying the principle to and which objects in the system’s surroundings are interacting significantly with it. Problem 1. Jack is pulling straight up on a thin rope attached to a bucket to lift some hand tools up to the roof where he is making repairs. The mass of the pail is 2 kg, and the total mass of the tools it contains is 8 kg. a) At the moment, the pail is moving slowly straight upward at constant speed. What force is Jack exerting on the rope? b) What is the net force exerted on the tools in the bucket? What objects in their surroundings are they interacting significantly with? c) How does the force Jack is exerting on the rope at the moment compare to the average force that he has exerted on the rope from the time he started to lift the bucket of tools until now? [Checkpoint 1 – Notice how the present motion of an object depends on the forces that

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Rec04_172Fall11 - Physics 172 Recitation 04 Fall 2011 As...

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