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1. Andy carried a 100 Newton box of books three kilometers. Bertram carried a 200 Newton box of potatoes two kilometers. Bertram claims he should be paid more more because he worked harder: in fact, he claims that he can prove by physics that he transferred more energy to the potatoes than Andy transferred to the books. Which statement is correct: No energy was transferred. Andy transferred more energy than Bertram Bertram transferred more energy than Andy They transferred the same amount of energy (not zero)
2. Harold is pulling a 270 N (60 pound) suitcase onto a 1 meter (3 ft 3") high porch using a 3 meter (9 ft 10") board as an incline. The suitcase has wheels, so that no force at all would be needed on a level surface. The force he needs to exert is 65 N (15 pounds) 90 N (20 pounds) 135 N (30 pounds) 270 N (60 pounds)
==> Please explain your answer.
3. Discussion question: Alice is playing on the see-saw with her little brother Billy. For perfect balance, she sits 1 meter from the central support, and Billy sits 1.5 meters from it; when she goes up and down 1 meter, Billy goes up and down 1.5 meters. Discuss the operation of the see-saw from the point of view of the energy needed to lift and lower each person.
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