05 Work, energy, power
- Revision: key ideas in Work, Energy, Power
- Worksheets:
- Assignment 5.1: 2013 Sec 3 AS 5.1 Answers - Work Energy Power.pdf
- Hints & Numerical answers - Post any questions below!
- Q1(a) 60 000 J, (b) 1000 W, (c) 100 000 J (power supplied is 100%, while power developed is only 60%)
- Q2(a) 76 000 J (work done is transformed into gain in GPE and and gain in KE (calculated using final v = u + at))
- Q2(b) 4750 N (work done = thrust force x distance moved
- Q3(a) (i) largest KE of pendulum at lowest point; (ii) largetst GPE at highest point
- Q3(b) (i) gain in KE comes from loss in GPE (high towards low position), compare amount of loss of GPE
- Q3(b) (ii) power = change in energy (e.g. KE) / time interval t; same period so same t
- Q3(c) GPE changes into KE and vice versa during the oscillation. At any instant. total energy E = GPE + KE.
- If GPE = KE, this happens when total energy = 1/2 of E, deduce corresponding h.
- Practice quiz S3 Quiz 8B with answers.pdf
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