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Lecture: 3

Chapter 1 (iq01)

· Momentum: p=\gamma mv.

· Nonrelativistic (NR) vs relativistic (R)

o \beta < \beta_cr , NR. Choice of \beta_cr, e.g. 0.1

o \beta >\beta_cr, R.

· Changes of momentum vector: Dp=p_f - p_i .

o Two cases in uniform circular motion.

o Difference between |Dp| and D|p|.

o Projectile motion: Changes in || and perpendicular component of the velocity vectors.

· Preview on the momentum principle.

Class announcements:

· A correction: In paragraph 6 of the firstday handout: The correct number of homework drops is 3 (not 6).

· Webassign enrollment: last check (early morning) 102; Quest enrollment: 124. Before next lecture, you should have completed ch1-h3and previewed the materials in ch2.

· TA sessions begin this week.

· There will be online office hours. (Hours will be posted in TA & LAs homepage)