Lecture 9

# Lecture 9 - Chapter 8 Rotational Motion Announcements:...

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Chapter 8 – Rotational Motion Announcements : Discussion sessions (7-9 PM in YKK220-001) – Monday by email appointment only with TA Edward Coakley at [email protected] Tuesday come as you please (no appt) General Physics Help (8 – midnight, Silliman D.H.) Today : Homework #4 due Wednesday Pick up: graded reading quizzes (sol’s on web) Grade sheet posted on web Today’s Topics : Rotational Motion Torque Angular Momentum Conservation of Angular Momentum BIG PICTURE of Conservation Laws! Introduction to Fluids and Pressure? Reading Quiz – Chapter 8

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Rotational Inertia Rotational Inertia moment of inertia analog of mass I = mass x square of distance from axis = m r 2 Back to - Coke cans rolling down ramp: Full Empty Empty can has larger rotational inertia difficult to get rolling slower Spin raw eggs! Spin boiled eggs! I = mr 2 I = 1/2 mr 2 Difference?
What is the rotational analog of force? Torque = product of force and lever arm (sometimes called twisting force) Torque = Applied force x lever arm = F x l Most Effective is a push (force): Maximizes Torque (other examples - see-saw, lever & fulcrum,. .) lever arm = distance from axis of rotation to a line drawn along direction of applied force F l

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## This note was uploaded on 04/07/2008 for the course PHYS 110 taught by Professor Johnharris during the Spring '08 term at Yale.

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Lecture 9 - Chapter 8 Rotational Motion Announcements:...

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