PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc....
-
Upload
barnard-richardson -
Category
Documents
-
view
215 -
download
0
description
Transcript of PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc....
![Page 1: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/1.jpg)
PHY 2048CGeneral Physics I with lab
Spring 2011CRNs 11154, 11161 & 11165
Dr. Derrick BoucherAssoc. Prof. of Physics
Session 10, Chapter 9
![Page 2: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/2.jpg)
Chapter 9 HomeworkChapter 9 HomeworkDue Friday @ midnightDue Friday @ midnight
![Page 3: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/3.jpg)
Chapter 9Practice Problems
11, 23, 25, 29, 31, 35, 39, 55Unless otherwise indicated, all practice material is from the “Exercises and Problems” section at the end of the chapter. (Not “Questions.”)
![Page 4: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/4.jpg)
Example, Problem 9-8, p. 262
![Page 5: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/5.jpg)
Impulse and MomentumImpulse and MomentumMomentum is the product of a particle’s mass and velocity, has units of kg m/s, and is given by
The impulse upon a particle is defined as
Impulse has units of N s, but you should be able to show that N s are equivalent to kg m/s. The impulse-momentum theorem is
![Page 6: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/6.jpg)
![Page 7: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/7.jpg)
EXAMPLE 9.2 A bouncing ball
QUESTION:
![Page 8: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/8.jpg)
EXAMPLE 9.2 A bouncing ball
![Page 9: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/9.jpg)
EXAMPLE 9.2 A bouncing ball
![Page 10: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/10.jpg)
EXAMPLE 9.2 A bouncing ball
![Page 11: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/11.jpg)
EXAMPLE 9.2 A bouncing ball
![Page 12: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/12.jpg)
EXAMPLE 9.2 A bouncing ball
![Page 13: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/13.jpg)
EXAMPLE 9.2 A bouncing ball
![Page 14: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/14.jpg)
Example, Problem 9-8, p. 262
![Page 15: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/15.jpg)
Conservation of Momentum
![Page 16: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/16.jpg)
Conservation of Momentum
Stated mathematically, the law of conservation of momentum for an isolated system is
The total momentum after an interaction is equal to the total momentum before the interaction.
![Page 17: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/17.jpg)
Example, Problem 9-18, p. 263
![Page 18: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/18.jpg)
Conservation of Momentum Depends on the System
![Page 19: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/19.jpg)
Conservation of Momentum Depends on the System
![Page 20: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/20.jpg)
![Page 21: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/21.jpg)
Problem-Solving Strategy: Conservation of Momentum
TWO (or more) DIMENSIONS
![Page 22: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/22.jpg)
Example, Problem (made-up)
![Page 23: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/23.jpg)
Chapter 9. Clicker QuestionsChapter 9. Clicker Questions
![Page 24: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/24.jpg)
The cart’s change of momentum is
A. 30 kg m/s.B. 10 kg m/s.C.–10 kg m/s.D.–20 kg m/s.E.–30 kg m/s.
![Page 25: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/25.jpg)
A. They exert equal impulses because they have equal momenta.
B. The clay ball exerts a larger impulse because it sticks.
C. Neither exerts an impulse on the wall because the wall doesn’t move.
D. The rubber ball exerts a larger impulse because it bounces.
A 10 g rubber ball and a 10 g clay ball are thrown at a wall with equal speeds. The rubber ball bounces, the clay ball sticks. Which ball exerts a larger impulse on the wall?
![Page 26: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/26.jpg)
Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC?
A. vA > vC B. vA < vC
C. vA = vC
![Page 27: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/27.jpg)
A. vf = v2.
B. vf is less than v2.
C. vf is greater than v2, but less than v1.
D. vf = v1.
E. vf is greater than v1.
The two particles are both moving to the right. Particle 1 catches up with particle 2 and collides with it. The particles stick together and continue on with velocity vf. Which of these statements is true?
![Page 28: PHY 2048C General Physics I with lab Spring 2011 CRNs 11154, 11161 11165 Dr. Derrick Boucher Assoc. Prof. of Physics Session 10, Chapter 9.](https://reader036.fdocuments.net/reader036/viewer/2022062600/5a4d1b937f8b9ab0599c2259/html5/thumbnails/28.jpg)
An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge?
A. Right endB. Left end