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Chapter 8 – Rotational Motion
Announcements
:
Discussion sessions (79 PM in YKK220001) –
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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View Full Document 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  seesaw, 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.
 Spring '08
 JohnHarris
 Physics

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