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Take notes on 5-1 to 5-3 pg 108-118 HW 1: #1-5

Do Now. Turn in Lab Report. Take notes on 5-1 to 5-3 pg 108-118 HW 1: #1-5. Today’s Agenda. Work Time for Test corrections and Unit 2 Startup CN: Newton’s 1 st and 2 nd Laws. Homework. Projectile Results. Average: 75.4% Old Average: 82.2%. Do Now. Check yourself #1-5.

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Take notes on 5-1 to 5-3 pg 108-118 HW 1: #1-5

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  1. Do Now • Turn in Lab Report • Take notes on 5-1 to 5-3 • pg 108-118 • HW 1: #1-5 Today’s Agenda • Work Time for Test corrections and Unit 2 Startup • CN: Newton’s 1st and 2nd Laws Homework

  2. Projectile Results Average: 75.4% Old Average: 82.2%

  3. Do Now • Check yourself #1-5 Today’s Agenda • Take notes on 5-1 to 5-3 (pg 108-118) • HW 1: # 8, HW 2: #1, 2, 4 • HW Questions • Film Clips Homework to be stamped tomorrow Due Friday • Notes on all of chapter 5

  4. Answers • C • A • 4 • A • C • Whiplash occurs because of inertia. Your head wants to stay in the same place. Your car moves your body forward but leaves your head behind. OUCH!

  5. Homework questions?

  6. How to Read a Chapter in a Physics Textbook

  7. …because you need to learn how to learn from reading And because there are no retakes

  8. Focus on one section at a time • Outline each section (5-1, 5-2, 5-3) in detail, paying attention to terms in bold and their definitions • Whenever possible try to write definitions in wordsand pictures • Avoid detailed mathematical equations. Most of the A.P. Physics exam uses very general equations – your understanding of the concepts is most crucial at this point.

  9. Don’t do too much at once! • Do not carry try to read the whole chapter in one sitting. It will take time to absorb all of the ideas. • Each chapter has a Summary at the end (don’t they always?) Do your notes cover all the concepts addressed in the summary?

  10. Use the example problems to check your understanding • The answers are end of the example, but you should carefully think through your answer before looking.

  11. Brain Break As you watch the clips, consider the following questions: • Where are Newton’s laws of force present? • Are Newton’s laws accurately portrayed? • Are any laws of physics broken in order to make the clip more interesting? If so, how? • What questions does this clip leave you with?

  12. Do Now • Take out Notes on 5-1 to 5-3 to be stamped • Check yourself #1-3 • FBD exercises (in HW packet) • HW 1: #6, 7 & HW 2: # 3, 5, 6 • Notes on all of chapter 5 • Quiz Corrections (2 quizzes) Today’s Agenda • Review Quiz • HW Questions • CN: Free body diagrams & 2nd law Homework

  13. Answers • B • B • D

  14. Corrections to the answer key • HW 2: #2a • 1125 N • HW 2: #4 • Answer is correct-ish, I made the answer negative because you are pushing DOWN. • HW 2: #7C • 55.2 m/s 2

  15. Do Now • Turn in Quiz Corrections (there are 2!) • Turn in notes for Ch 5 • Check yourself #4-6 • HW 3: #1 & 4 HW 4: #5 & 6 • Start Notes for chapter 6 (they are due next Friday) Today’s Agenda • HW Questions • Finish CN examples? • Force Quiz 1 Homework

  16. Answers • B • B • D • C • C • B

  17. Do Now • Turn in notes for Ch 5 • Check yourself #1-4 • HW 3: #5 & 6 HW 4: #3 & 5 • Notes: 6-2 to 6-4 are due Friday Today’s Agenda • HW Questions • Finish CN examples? Homework

  18. Answers • C • B • D • E

  19. Newton’s Laws Results Average: 85.8 % Old Average: 75.4%

  20. Today’s Aim • Draw FBD for objects on slopes • Break Forces into x and y components • Compose Net Force equations

  21. HW 3: #5 • A 34.5 kg block rests on the ramp as shown in the drawing. What is the tension in the line that is connected to the top of ramp?

  22. Language Objective Students will be able to explain what force causes a ball to accelerate down a hill

  23. Do Now • Check yourself 9-10 • HW 3: #8, 9 HW 4: #4 HW 7: #1,2, 3 • Notes: 6-2 to 6-4 are due Friday Today’s Agenda • HW Questions • Finish CN examples? Homework

  24. Answers • B • D

  25. CHANGE in Schedule Week 2 (Objectives: 2c-1, 2c-2, 3a, 3b, 3c, 3d) Pulleys, Ramps, Net force & Newton's third law • Write equation for Fnet = sum of all F acting in the x or y direction w/appropriate signs accounting for angles (+/-) • Be able to draw the location and direction of friction on a FBD • State Newton’s 3rd Law • Be able to identify the action force, reaction force, and effects of both for given situations Week 3 (Objectives: 2d-1, 2d-2, 2d-3, 2e-1) Friction and terminal velocity • Define friction • Explain the variables that affect the strength of frictional force • Know when to use the kinetic vs. static coefficient of friction • Explain freefall and terminal velocity using Newton’s 2ndLaw

  26. HW 3: #8 • A 4.50 kg block rests on a smooth ramp as shown. It is attached to a 4.20 kg block by a very low mass string that is run over a low friction pulley. When the system is released, what direction will the blocks travel and what will their acceleration be?

  27. HW 3: #9 • Two masses are connected by a light string that runs over a frictionless pulley as shown. What is the acceleration of the system when the masses are released and allowed to move?

  28. HW 4: #4 • Three masses are connected by a light string that passes over a frictionless pulley as shown. (a) What is the acceleration of the system? (b) What are the tensions in the strings?

  29. Do Now • Force Body Diagram Quiz Today’s Agenda • HW 4: #1, 2; HW 3: 2, 3; HW 6: 1, 4, 7 • Quiz corrections due Friday • Notes: 6-2 to 6-4 are due Friday • HW Questions • Newton’s Third Law Homework Friday HW: HW 5: #2; HW 6: #3, 6; HW 7 #11-15

  30. Do Now • Turn in Quiz Corrections & Notes 6-2 to 6-4 • 3rd law check yourself! • HW 5: #2; HW 6: #3, 6; HW 7 #11-15 • Binderize! (organize your papers) • Upcoming: Notes: 6-1 are due Tuesday Today’s Agenda • HW Questions • Key points review • Shortest quiz ever • Film: Table Cloth Trick Homework

  31. Answers A.) 0.066 m/s2 B.) 0.033 m/s C.) 909.3 s = 15.1 min

  32. Let’s say you are 50 kg and throw a 1.1 kg space rock forwards, accelerating it at 3.0 m/s2. Assume the time for the throw is 0.5 s

  33. Fx= Fx is more / equal / less than 0 because: Fy= Fy is more / equal / less than 0 because: The block on the ramp moves up the slope. (Assume there is friction between the block and the slope).

  34. The block on the ramp moves up the slope. (Assume there is friction between the block and the slope). • An equivalent FBD would be:

  35. Do Now • Turn in HW 1-4 • HW 5: 1, 2, 3; HW 6: #2, 3 • Binderize! (organize your papers) • Notes: 6-1 are due Tuesday • Newton’s Law test on Friday Today’s Agenda • HW Questions • CN: static and kinetic Friction Homework

  36. Discuss • If gravity pulls downward on a textbook with a force of approximately 100N, how large of an upward force must you exert on the book to... • a)   hold the book up, at rest? • b)   move the book upward at a constant speed of 4m/s?

  37. Newton’s Laws Results Average: 53.3 % Old Average: 85.8%

  38. By the way… Question 3 was from Pg125 of the textbook

  39. Corrections to the answer key • HW 1: #7C • 55.2 m/s 2 • HW 2: #2a • 1125 N • HW 4: #2 • 0.985 kg (thanks Chris) • HW 4: #5 • B) 2.36 s • C) 42.7 m • D) 6.38 m • HW 7: #3 • B) 2938 N

  40. Projectile Retakes • Monday & Tuesday lunch or after school Can replace scores for: • ProjoQuizo 1 (out of 97 points) • The wretched projectile test (out of 100 points)

  41. Do Now • Turn in HW 1-4 • HW 5: 1, 2, 3; HW 6: #2, 3 • Binderize! (organize your papers) • Notes: 6-1 are due Tuesday • Newton’s Law test on Friday Today’s Agenda • HW Questions • CN: static and kinetic Friction Homework

  42. Do Now • Turn in Notes 6-1 • Turn in Quiz: Newton’s Laws (I need to grade it… >.< ) • Multiple Choice Practice #1-6 • HW 5: #4; HW 6: #5. 6; HW 7: #4, 5, 6 • Binderize Quiz tomorrow! • Newton’s Law test on Friday Today’s Agenda • HW Questions? • Practice MC Q’s • CN: terminal velocity Homework

  43. Answers • A • E • E • D • C • B

  44. Do Now • Binder Quiz! • Up next: Check yourself Terminal Velocity #5-8 and Friction review (both sides) • HW 7: #7-10 • Finish Review Questions • Complete Test Corrections • Study for Newton’s Law test on Friday Today’s Agenda • Friction Review • HW Questions? • Review Time. Homework

  45. Terminal Velocity Answers 5. D 6. A 7. A 8. D

  46. A Martian lander is approaching the surface. It is slowing its descent by firing its rocket motor. Which is the correct free-body diagram for the lander?

  47. A Martian lander is approaching the surface. It is slowing its descent by firing its rocket motor. Which is the correct free-body diagram for the lander?

  48. An elevator that has descended from the 50th floor is coming to a halt at the 1st floor. As it does, your apparent weight is • More than your true weight. • Less than your true weight. • Equal to your true weight. • Zero.

  49. An elevator that has descended from the 50th floor is coming to a halt at the 1st floor. As it does, your apparent weight is • More than your true weight. • Less than your true weight. • Equal to your true weight. • Zero.

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