1. Student Evaluations

2. Conservation of Angular Momentum
12/7/2018
Experiment 6
Conservation of Angular Momentum

3. 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

4. Part 1. Angular Momentum under Changing I
Part 1 : Angular Momentum & Rotational KE
Initial I large, final I small …which w is larger?

5. 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?

6. 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. mw T a

7. Applications Source: Active Power Website Gyroscope!
Flywheels - Uninterruptible power
Source: Active Power Website

8. 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