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Physics on Friday
9-28-07
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To do…• Answers for first test
• Questions on Homework handout
• Class example problem
• Hand in the graph created by you walking before the motion detector with the analysis
• Talk about the causes of motion
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Any questions on the homework handout?
Results are due Monday, if needed
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New problem• Joe runs with a constant velocity of
5.4 m/s for 20 s before he reaches a pile of leaves. It takes 1.5 s for Joe to come to a stop in the pile. What is his rate of acceleration in the leaf pile and how far did Joe travel overall?
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Answer
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What causes objects to move or change their motion?
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Forces !
• A force is anything that creates a push or pull on an object
• Forces from contact• Forces at a distance
• Units (Newtons-vs-Pounds)
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What weighs 1000 N?
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Determine your weight in Newtons
• Take you weight in lbs and divide by 2.2
• Then multiply the result by 9.8.
• The 1st action converts from lbs kg• The 2nd action converts from kg N
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Football player (220 lbs)
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What weighs 100 N?
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Freshman backpacks
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What weighs 10 N?
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The average textbook
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What weighs 1 N?
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A smallish apple
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Homework in book
• What force is necessary to accelerate a 1250 kg car at a rate of 40 m/s2?