11lecture2a08

# 11lecture2a08 - Physics 2A Lecture 11 Feb 1 Vivek Sharma...

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Physics 2A Lecture 11: Feb 1 Vivek Sharma UCSD Physics

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QUIZ 4
Communicating/Receiving Exam Questions Before Taking Exam is Academic Dishonesty

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And now my little rocket that could Newton’s 3 rd Law In action
CAR ROAD Your Car Goes Vroom Vroom ! How? Engine can not push the car forward since it’s a part of it ! Engine drives either the front or back axle of car which causes tires to rotate. Tires in turn push against the road surface thru force f between tire and road surface. 3 rd law road must then push against the tires with equal and oppositely directed force = -f . This external force causes car to accelerate Vroom Vroom !. ..what happens if tire is “bald” ? f -f

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Be Careful When Analyzing Motion Newton's laws very simple but applying them to different scenarios can be difficult ! Some tips: 2. Only forces acting on matter ! need to identify all forces on the chosen body, then THAT fin body d F G 1. 1st & 2nd law applies to a . So amongst various choices first identify the body spec to f ific bod ocus y on. members body Disregard for 3. Only of action-reaction pair that act on of focus matter. that ces OTHER this body exerts on bodies in the environment
Free-Body Diagrams Diagram showing the body by Free of surr its oun elf, ding se Vectors to denote magnitude and direction of forces applied on it by all OTHER bodies that interact with it Dont include any force that this body exer on ano ts ther Never include 2 forces from an action-reaction pair in the free-body diagram (they act on diff bodies) same Forces that a body exerts on itself is never included since it cant affect motion ! What does a Free-body diagram look like: already using it !

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Some Free Body Diagrams W N W W N N y N X xx She is i She sprint n vertical s bec equi au li se N ma brium =
Chapter 5.1: Equilibrium F0 = G Gymnast (m G =50 kg) hangs from ceiling with massless rope. What is her weight?

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11lecture2a08 - Physics 2A Lecture 11 Feb 1 Vivek Sharma...

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