# reviews answers.doc - PHYSICS FORCES TEST REVIEW WORKSHEET...

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PHYSICS FORCES TEST REVIEW WORKSHEET – This paper is not worth any points, the key is posted. 1. A man has a mass of 77kg. What force is the Earth applying on him? 754.6N 2. A man has a weight of 2470 newtons on Earth and a weight of 243 newtons on planet Z. What is the acceleration due to gravity on planet Z? 0.96m/s 2 Use this graph to answer questions 3-5. This is a 1204g wood mass being pulled by the force meter at a constant velocity. -- 1.2-- Force (N) -- 0.8-- -- 0.4-- -- time (s) 3. What force was applied to get this object moving? F f = 1.1N 4. What is the static coefficient of friction for these 2 surfaces? F N = 11.8N  = 0.093 5. What is the sliding coefficient of friction for these 2 surfaces?  = 0.068 F f = 0.8N 6. What force would have to be applied to start a 12.3kg wood block moving on a surface with a static coefficient of friction of 0.438? F f = 52.8 N 7. If planet Dwart has a mass of 2.3 x 10 6 kg and planet DuHunt has a mass of 3.5 x 10 7 kg, what is the force of attraction between the 2 planets if they are 4673km apart?
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