1) Work is done on a system when: a) A force moves an object over a distance. b) Energy does not change. c) A force keeps an object from moving. d) None of these 2) Simple machines are:  a) Found in nature. b) Made by humans. c) All of these d) none of these 3) Simple machines amplify work by: a) Using smaller force over larger distances. b) Using bigger forces over smaller distances. c) Changing the direction that a force pushes or pulls. d) All of these 4) Which of these is NOT a simple machine? a) inclined plane b) lever c) handle d) pulley 5) Simple machines can be combined together to make: a) Complete machines b) Complex machines c) Simpler machines d) Multiple machines

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