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lecture08 - Exam I Physics 101 Lecture 08...

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Physics 101: Lecture 8, Pg 1 Physics 101: Lecture 08 Today’s lecture will cover Chapter 5 Exam I http://www.youtube.com/watch?v=ZyF5WsmXRaI
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Physics 101: Lecture 8, Pg 2 A B C Answer: B v A ball is going around in a circle attached to a string. If the string breaks at the instant shown, which path will the ball follow (demo)?
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Physics 101: Lecture 8, Pg 3 centripetal acceleration Acceleration is due to change in direction, not speed. Since the object turns “toward” center, there must be a force toward center.
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Physics 101: Lecture 8, Pg 4 Consider the following situation: You are driving a car with constant speed around a horizontal circular track. On a piece of paper, draw a Free Body Diagram (FBD) for the car. How many forces are acting on the car? A) 1 B) 2 C) 3 D) 4 E) 5 f W F N correct Σ F = m a = m v 2 /R R 1% 18% 42% 25% 13% “Friction, Gravity, & Normal”
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Physics 101: Lecture 8, Pg 5 Acceleration: Σ F = ma Centripetal Acceleration Force of Motion (Inertia not a force) Forward Force, Force of velocity Speed Centrifugal Force (No such thing!) Centripetal (really acceleration) Inward force (really friction) Internal Forces (don’t count, cancel) Car Engine
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