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Lecture_5_(Student_Handout)

# Lecture_5_(Student_Handout) - PHYS 172 Modern Mechanics...

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1 Summer 2009 PHYS 172: Modern Mechanics Lecture 5 – Non-constant Forces Read 3.1 – 3.5 Reading Quiz #1-2

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2 Shoot the monkey y x Multiparticle Systems (Ch. 2 stuff) Today: Non-Constant Forces Gravity (if time) Spring Force Updating Motion With Non-Constant Forces
3 Adding Forces Together air F Earth F road ? F Consider a bus traveling at a constant velocity. = CLICKER QUESTION #4

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4 Adding Forces Together air F Earth F Consider a bus traveling at a constant velocity . System = bus Surroundings = air, Earth, road, . . . = In Chapter 4 we’ll look more closely at why the ground exerts a force in this direction: the x- component is due to friction, and the y-component is called a “normal force”. road F Why was the second element of our procedure “List objects in the surroundings that have significant influence on the system”? For example, when we analyzed the baseball last lecture, why did we neglect all the forces acting inside the ball? Reciprocity Because all the forces inside the system come in pairs and cancel out. The only forces left over are forces from the surroundings!
5 A 2-Particle System 1 2 total p p p Looking at particle 1 as system and apply momentum principle: 2 p 1 p tot p Choosing particle 2 as system and apply momentum principle:   2 on 2 by 1 on 2 by objects other than 1 p F F t

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Lecture_5_(Student_Handout) - PHYS 172 Modern Mechanics...

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