Due tomorrow is the following work from the book:
Read pages 108-111. Write down 3 important things. Then, on pages 119-121, do Rev. #9, Plug and Chug #7 and Think/Explain #3. Remember that the total energy of a system has to stay the same. The formula we use is E total = KE + PE The HW due tomorrow:
On pages 119-121 in the Hewitt textbook, do the following questions: Review #6, 8, 11 Think and Explain #4 Think and Solve #1 Remember that the TOTAL Energy stays the SAME. KE depends on speed and mass PE depends on mass, gravity and height ME is another way of saying TOTAL Energy, and stands for TOTAL Mechanical 4. m = 80 kg v1 = 0 m/s a = 3 m/s/s t= 2 s a. v2 = v1 + at = 0 + 3 m/s/s X 2s = 6 m/s b. F = m a = 80 kg X 3 m/s/s = 240 N 5. a. m ashley = 40 kg m sydney = 60 kg F on sydney from ashley = 120 N b. asydney = F on sydney / mass of sydney = 120 N / 60 kg = 2 m/s/s c. Ashley will speed up backward because of Newton's third law a = 120 N / 40 kg = 3 m/s/s 6. brakes air bags head rests padded dashboard Inertia softer surface pushes head N's 3rd have to Newton's third so it won't F is smaller change motion stay at rest in a so head is use friction to rear end collision safer slow or stop ALSO: ABS brakes (stay with larger static vs. smaller kinetic) crumple zones (car can't push as hard on tree, N's 3rd) seat belts, apply a force to change your motion others? We are done with Newtons three laws of motion and with friction. The test will be next week, and will cover all of those items, including inertia, weight, mass, acceleration, action/reaction, free body diagrams, v/t graphs, and static/kinetic friction.
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AuthorMr. Gerard Gagnon Archives
May 2015
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