Chapter_9

# Chapter_9 - Chapter 9 Linear Momentum and Collisions...

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Momentum Momentum is conserved – even in collisions with energy loss. Collisions Center of mass Impulse Chapter 9: Linear Momentum and Collisions Reading assignment: Chapter 9.1 to 9.6 Homework: QQ2, AE1, AE5, 5, 9, 10, 11, 14, 19, 27, 28, 29, 32, 33, 37, 38, 65 Due date: Monday, March 21 v m p = All grades will be posted on our web page; listed by last four digits of student ID

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The linear momentum of a particle of mass m and velocity v is defined as v m p = The linear momentum is a vector quantity. It’s direction is along v . z z y y x x v m p v m p v m p = = = The components of the momentum of a particle: Chapter 9: Linear Momentum and Collisions
1, 2, 1, 2, constant or: i f i i f f p p p p p p p p = = = + = + Conservation of linear momentum

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(similar to blocks and spring HW problem) You (100kg) and your skinny friend (50.0 kg) stand face-to- face on a frictionless, frozen pond. You push off each other. You move backwards with a speed of 5.00 m/s. Quick quiz and demo: How are rocket ships (in space) able to change their velocity? 2. What is your momentum after you pushed off? A. 0 kgm/s B. 250 kgm/s C. 500 kgm/s D. 750 kgm/s E. -500 kgm/s 1. What is the total momentum of the you- and-your-friend system? A. 0 kgm/s B. 250 kgm/s C. 500 kgm/s D. 750 kgm/s E. -500 kgm/s 4. How much energy (work) did you and your friend expend? 3.
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Chapter_9 - Chapter 9 Linear Momentum and Collisions...

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