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8. What is the difference between mass and weight? Why would you mass be the same but your weight be different on the Moon compared to Earth?
9. What force resists motion between objects in contact? What is the difference between static and sliding friction? Does friction only occur between solid surfaces?
10. Why do some systems need lubricants? Provide an example of a system you know which requires the use of a lubricant.
11. Research on your own what 'compound machines' are. Give a definition of compound machines and provide two examples.
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