Wednesday, October 17, 2001
Announcements
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Exam 2 is now scheduled for Friday, October 26
Chapter 8 - Rotational Equilibrium and Rotational Dynamics
Problem: A 10-N force is exerted on a door handle at an
angle of 30 degrees from the normal. The door has a mass of 50 kg,
a height of 2 m, and a width of 1.5 m. How long will it take for
the door to close if it is initially at a 90 degree angle and not moving?
Demos:
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How to turn on a frictionless stool
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Rotating stool and dumbells - conservation of angular momentum
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Rotating stool and bicycle wheel
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Catch ball on stool: L = r x p
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rattleback
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Ring, disk, and sphere - Which will win the race down a ramp?
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All disks roll the same
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Boomerang
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Short and long falling sticks - Which falls faster?
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Faster than
"g"
Assignments: