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Physics 1A, Section 6

Physics 1A, Section 6. October 27, 2008. Section Business. Section 6 for Monday, Nov. 3 is canceled . Visit another section if you wish. Office hour for Nov. 4 is unchanged. Homework due Wednesday: Consider solving problems QP21 and QP28 in non-inertial frames with pseudoforces .

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Physics 1A, Section 6

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  1. Physics 1A, Section 6 October 27, 2008

  2. Section Business • Section 6 for Monday, Nov. 3 is canceled. • Visit another section if you wish. • Office hour for Nov. 4 is unchanged. • Homework due Wednesday: • Consider solving problems QP21 and QP28 in non-inertial frames with pseudoforces.

  3. Week 4 Reading/Lecture Recap • T.M.U. chapters 8-9 + lectures: • gravity: F = GM1M2/r2, always attractive • electric charges: F = Keq1q2/r2, attractive or repulsive • springs: F ≈ -kx • normal forces • kinetic friction: F ≈ mkN, opposes relative velocity • static friction: F ≤ msN, opposes relative acceleration • viscous force: F ≈ -Khv • pseudoforce in linearly accelerating frame: -ma0 • pseudoforce in rotating frame: mw2r outward • There is also a Coriolis force on moving objects (Chapter 14).

  4. Quiz Problem 29

  5. Quiz Problem 29 • Answer: • mA to the left • ma = mAcosq – mgsinq – mN, N = m(Asinq + gcosq) • a = A(cosq – msinq) – g(mcosq + sinq); q < 37°

  6. Quiz Problem 49

  7. Quiz Problem 49 • Answer: • {[k3 + (k1-1 + k2-1)-1]-1 + k4-1]-1

  8. Tension in a Rope Draped over a Table mass per unit length r L

  9. Tension in a Rope Draped over a Table mass per unit length r T = rgL T T T L 0 0

  10. Thursday, October 30: • Quiz Problem 50 (energy and work) • something about potential energy • Optional, but helpful, to look at these in advance.

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