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13_05work

Page history last edited by johnlittlephysics 9 years, 6 months ago

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  

Post your questions/comments below. 

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