Physics 207: Lecture 16, Pg 1

Physics 207,Physics 207, Lecture 16, OctLecture 16, Oct 28 28 ‘‘0909TODAY:TODAY:

Review for Exam 2Review for Exam 2

ASSIGNMENTS:ASSIGNMENTS: Exam 2 Practice Problems on MPExam 2 Practice Problems on MP Solutions available at librarySolutions available at library reserve sitereserve site Exam Exam thurs thurs 5:45 - 7:005:45 - 7:00

- - note new venue:note new venue:2241 Chamberlin - Brian, Marcos, Hiren & Zhe's sections;2103 Chamberlin - all other sections

- topics- topics through Chapter 12.4through Chapter 12.4

Physics 207: Lecture 16, Pg 3

Exam 2 TopicsExam 2 Topics

Circular motion Newton’s Third Law - Dynamics Impulse Momentum Conservation Kinetic and Potential energy Work Energy Conservation Power Rigid Body Rotation (center of mass, kinetic energy but

no torque or angular momentum or statics)

Physics 207: Lecture 16, Pg 4

Physics 207: Lecture 16, Pg 5

Review: NewtonReview: Newton’’s Third Laws Third Law

Physics 207: Lecture 16, Pg 6

Physics 207: Lecture 16, Pg 7

Physics 207: Lecture 16, Pg 8

Physics 207: Lecture 16, Pg 9

Review: CollisionsReview: Collisions

Physics 207: Lecture 16, Pg 10

Physics 207: Lecture 16, Pg 11

Review: CollisionsReview: Collisions

Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver E was traveling eastward at 12 m/s, and driver N, nort hward. After the collision, the two cars remain joine d together and slide, with locked wheels, before coming to rest. Police on the scene measure the length d of the skid marks t o be 9 meters . The coefficient of friction between the locked wheels and the road is equal to 0.9. If driv er E had been traveling with a speed of exactly 12 meters per second b efore the collision, what must d river N's speed have be en before the collision?

Physics 207: Lecture 16, Pg 12

Review: ImpulseReview: Impulse

Physics 207: Lecture 16, Pg 14

Physics 207: Lecture 16, Pg 15

Review: Work and EnergyReview: Work and Energy

A skydiver of mass m jumps from a hot air balloon and falls a distance d before reaching a terminal velocity of magnitude v. What is the work Wdrag done on the skydiver, over the distance d, by the drag force of the air? (in terms of d, v, m, and g) Find the power Pdrag supplied by the drag force after the skydiver has reached terminal velocity v.

Physics 207: Lecture 16, Pg 16

Rigid Body RotationRigid Body Rotation

Compute by direct integration center of mass andmoment of inertia of 1-D objects

Rotational Kinetic Energy