Physics 207: Lecture 10, Pg 1Physics 207, Physics 207, Lecture 10, OctLecture 10, Oct 7 7 ‘‘0909TODAY:TODAY:One more thing about rotational motionOne more thing about rotational motionMomentum:Momentum: Chapter 9Chapter 9A peek at Kinetic Energy (Chapter 10, for next weekA peek at Kinetic Energy (Chapter 10, for next week’’sslab on momentum and collisions)lab on momentum and collisions)Assignments:Assignments: Read Chapter 4.7 (angular acceleration) HW 5 due Friday, Oct 9, 6 pm Read Chapter 10 (Energy) for next weekPhysics 207: Lecture 10, Pg 2Physics 207: Lecture 10, Pg 3 Newton’s Third LawPhysics 207: Lecture 10, Pg 4Physics 207: Lecture 10, Pg 5Physics 207: Lecture 10, Pg 7Physics 207: Lecture 10, Pg 10Boxers:Boxers: What is the acceleration of this poor guy’s head?aPhysics 207: Lecture 10, Pg 11Assume: marm~ 7 kg varm~7 m/s time of impact Δt ~ 0.01 s mhead ~ 6 kgEstimate the acceleration of the boxer’s head (!) A. 7 g B. 70 g C. 700 gPhysics 207: Lecture 10, Pg 14Physics 207: Lecture 10, Pg 15Physics 207: Lecture 10, Pg
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