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Chapter N2

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Chapter N2

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  1. Tomorrow, Tuesday, Nov. 6, at 7:00 pm in the coffee room of the Library there will be a discussion of the effects of global warming on the Arctic regions. 25 bonus points will be given for three short paragraphs containing what you believe to be the most important items discussed. The discussion will last less than an hour. • Due Friday: N2B.4, B.5, B.10, S.5 • Acceleration labs with attempts for bonus points are due now on the front desk.

  2. Chapter N2 Vector Calculus

  3. Definition of velocity When the velocity is constant Definition of acceleration When the acceleration is constant For the case of uniform circular motion

  4. Instantaneous vs. average Path of particle r(t+Δt) Δr A r(t) O This is the position of the point A at time t.

  5. Instantaneous vs. average Path of particle Δr r(t+Δt) A r(t) O This is the position of the point A at time t.

  6. Instantaneous vs. average Path of particle As Δt gets smaller, the average velocity approaches the instantaneous velocity. Δr A r(t+Δt) r(t) O This is the position of the point A at time t.

  7. The position of a ball is shown every 0.1 sec. What is the velocity at t=0.3 sec? Is the ball speeding up or slowing down? 0.1 0.3 0.4 0.5 0.7 s t=0 0.2 0 20 40 60 80 100 120 140 cm Calculate the velocity at 0.3 seconds. 110 cm – 65 cm = 45 cm in 0.2 s v= 225 cm/s

  8. Problems N2 • Due Wednesday. • N2B.4, B.5, B.10, S.5

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