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January 25, 2010

January 25, 2010. Do Now Take out your study guide. Matching Set 1. 1. b 2. c 3. f 4. g 5. d 6. a 7. e 8. h. Matching Set 2. 1. G 2. F 3. C 4. E 5. A 6. B 7. D. Set 3. 11. D 12. C 13. A 14. B. Fill in blank Set 1. 1. repel, attract 2. friction, conduction, induction

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January 25, 2010

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  1. January 25, 2010 • Do Now • Take out your study guide

  2. Matching Set 1 • 1. b • 2. c • 3. f • 4. g • 5. d • 6. a • 7. e • 8. h

  3. Matching Set 2 • 1. G • 2. F • 3. C • 4. E • 5. A • 6. B • 7. D

  4. Set 3 • 11. D • 12. C • 13. A • 14. B

  5. Fill in blank Set 1 • 1. repel, attract • 2. friction, conduction, induction • 3. increase • 4. parallel • 5. series

  6. Fill in blank Set 2 • 1. Newton’s third law. • 2. terminal velocity, projectile • 3. centripetal force • 4. static friction • 5. air resistance • 6. Newton’s second law • 7. momentum

  7. Fill in blank Set 2 • 8. conservation of momentum • 9. Gravity • 10. weight • 11. distance • 12. Newton • 13. static friction • 14. Sliding friction

  8. Multiple Choice Questions • 1. E. 2. B 3. B • 4. E 5. D 6. D • 7. F 8. A 9. E • 10. B 11. G 12. H

  9. True or False • 1. F 2. T 3. F 4. T • 5. F 6. T 7. F 8. T • 9. F 10. T 11. F

  10. Determine Types of matter • 1. Hom 2. C • 3. E 4. Het • 5. E 6. Het • 7. Hom 8. C • 9. E 10. Hom

  11. Open Ended Questions • 1. • 2. V = IR = 10 x 7 = 70 V • 3. I = V/R = (7x1.5)/5 = 2.1 A • 4. I = P/V = 90/(4x1.5) = 15A • 5. V = P/I = 3400/18 = 188.8 V • 6. W = Fxd = 100 x 1 = 100 J

  12. 7. P = W/t = 1500 / 30 = 50 W • 8. To lift the first object, the kinetic energy is ½ 2kg x 22=4 J To lift the second object, the kinetic energy is ½ 4kg x 32=18 J Therefore, the second object has more kinetic energy.

  13. 9. The potential energy for the first object is mgh = 2 x 9.8 x 10 = 196 J • The potential energy for the first object is mgh = 4 x 9.8 x 10 = 392 J Therefore, the second object has more potential energy.

  14. Corrections • 10. Calculate the momentum of a 100-kg football player, a fullback, moving at a velocity of 3.5 m/sec. • Momentum = mass x velocity = 100 x 3.5 = 3500 kg m/sec

  15. 10b. Calculate the acceleration of a 10 kg mass when a 40 N force is applied to it. • Acceleration = F/m = 40/10 = 4 m/s2

  16. 11. Thickness of one business card is 1.95 cm / 62 = 0.031 cm • 12. Mass of one staple is 7.2 g / 323 = 0.02 g

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