Lect08 - PHYS 172 Modern Mechanics Fall 2011 Lect 8&9 Rate...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Fall 2011 PHYS 172: Modern Mechanics Lect. 8&9 - Rate of Change of Momentum Read 5.1-5.7 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
TODAY Forces on a System Changing Momentum Circular Motion 2
Background image of page 2
Rules for Identifying Forces on a System Choose "The System" Draw arrows for all forces due to objects in the surroundings that interact with The System. – Objects that touch The System – Objects that interact from a distance Label each force with the name of the object in the surroundings 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example – Hanging Ball System: Ball Surroundings: Earth, Wire Free-body diagram ! F net = d ! p dt 4
Background image of page 4
Equilibrium with two strings net dp F dt = ! ! m Static equilibrium mg ! ! F 2 ! F 1 Know mass. Need to know the force F 2 required to achieve θ x y 0 dp dt = ! ! ! F 1 + ! F 2 + m ! g = ! 0 Geometrical: mg ! ! F 2 ! F 1 ! F 2 = mg tan ! ! F 2 = mg tan ,0,0 5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Perpendicular component (to trajectory) Parallel component (Along trajectory) Changing momentum ! p
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/07/2011 for the course PHYS 172 taught by Professor ? during the Fall '08 term at Purdue.

Page1 / 11

Lect08 - PHYS 172 Modern Mechanics Fall 2011 Lect 8&9 Rate...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online