PHYS111 Lecture : Phys 111
18 Apr 2013
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Conservative system: ei = initial mechanical energy = kei + pei. Hooke"s law = spring = -k . Wext = ext = fext x. Add friction: wext = ke + pe + te. Power: kx2 = pe stored by spring the rate at which energy is transferred from one system to another. If an external force is applied giving external work wext over a time interval, then the average power is pavg = Instantaneous power: pinst = ext inst = ext . Impulse = = avg t = area under force-time graph.
