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Student Evaluations. Experiment 6. Conservation of Angular Momentum. Safety! Do not stand on rotating platform &amp; 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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Presentation Transcript

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)

Rotational Kinetic Energy

Part 1. Angular Momentum under Changing I

Part 1 : Angular Momentum & Rotational KE

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

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?

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.

Applications

Gyroscope!

Flywheels - Uninterruptible power

Source: Active Power Website

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