1. You push a table through 3m with a force of 30N. How much work have you done on the table? The table fails to accelerate continuously due to friction. What form of energy is created? ( 90 J)
2. In lifting a 20kg bucket of water through 2m from a hole, work has been done and energy transformed. What work have you done, where have you obtained the energy from and what form of energy has the water and bucket now got? (392J)
3. You are writing an English essay of total length 3 pages. Estimate how far the pen moves in your script and how much force you apply to the pen on average. Hence estimate how much work you do on the pen. Where does the physical (not mental! ) energy go that you expend? (Is there such a quantity as mental energy?) ( ~ 4J)
4. A major environmental push is for "energy conservation" in the house, work place etc. How does this conception differ from the pure physicists' conception of energy conservation?
5. Comets, in their highly elliptical orbits, travel fastest near the Sun and slowest out beyond Jupiter. Discuss the energy changes in such an orbit.
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