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Student Evaluations. Experiment 6. Conservation of Angular Momentum. Safety! Do not stand on rotating platform & watch your fingers with the bicycle wheel. Conservation of angular momentum Torque (analogous to F=ma for linear motion) Moment of Inertia- (analogous to mass)

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Experiment 6

Conservation of Angular Momentum


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Safety! Do not stand on rotating platform

& watch your fingers with the bicycle wheel

Conservation of angular momentum

Torque (analogous to F=ma for linear motion)

Moment of Inertia- (analogous to mass)

Rotational Kinetic Energy


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Part 1. Angular Momentum under Changing I

Part 1 : Angular Momentum & Rotational KE

Initial I large, final I small …which w is larger?


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Part 2. Conservation of L in a Rotating System

Look at the direction the wheel is spinning … which

way will you spin when you flip it over? What is the final

L of you and the platform? What is the final L of the wheel?

Can you spin in the other direction? How?


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T

a

mw

Part 3. Conservation of L in Collision

  • Measure angular velocity of the rotating system before collision:

  • 2. Measure angular velocity of the rotating system after collision.

  • Is Angular Momentum conserved?

  • Is Rotational Kinetic Energy conserved?

T

a

To find out you’ll also need to measure the moment of inertias

before and after the collision. Accelerate the before and after

configurations and solve for the moment of inertias.


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Applications

Gyroscope!

Flywheels - Uninterruptible power

Source: Active Power Website


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Remote Laboratory

  • Optional way of doing E7

  • Can start right after this class

  • Identical to in-class experiment takes about 2 hours.

  • Must complete before scheduled in-class session

  • Pickup gold handout


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