Angular Momentum Friday, November 7. Today: Angular Momentum Chapter 9 Section 7.

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Presentation transcript:

Angular Momentum Friday, November 7

Today: Angular Momentum Chapter 9 Section 7

Angular Momentum, L Compare to linear momentum Direction??

Conservation of Angular Momentum What is needed for L to be conserved?

Problem 9.34 Divers change their body position in midair while rotation about their c of m. A diver leaves the board with her body nearly straight, then tucks into a somersault position. If her moment of inertia in the straight position is 14 kgm 2 and in tuck is 4.0 kgm 2 by what factor is her angular velocity when tucked greater than when straight?

Problem 9.34

This week’s Laboratory Experiment

L conserved?

Problem 9.32 What is the angular momentum of a bar rotating at 120 rpm. The bar rotates about its center, has a mass of 500g and is 2 m long.

Problem 9.32

Monday Energy and Work Reading: 10: 1-3 Problems: 9: 30, 32, 34, 35 A closed (isolated) system has a total energy E which is constant, but the form of the energy can change. For example, thermal, kinetic, chemical, … We shall be concerned with the conversion of one kind of energy into another and the exchange of energy with the outside world.