All Flashcards
What is the effect of a skater pulling their arms inward during a spin?
The skater's moment of inertia decreases, causing their angular velocity to increase to conserve angular momentum.
What is the effect of applying an external torque to a rotating object?
The object's angular momentum will change.
What happens to the rod's angular speed if the disk bounces back in the disk and rod collision?
The rod's angular speed will be greater because the disk transfers more angular momentum to the rod.
Compare and contrast linear and angular momentum.
Linear momentum: mass in linear motion. Angular momentum: moment of inertia in rotational motion. Both are conserved in closed systems.
Compare the effect on final angular speed when a disk sticks versus bounces off a rod.
Sticking: Rod gains angular momentum. Bouncing: Disk transfers more angular momentum, so the rod's angular speed will be greater.
In the Skater Example, what happens to the skater's angular velocity if she decreases her moment of inertia?
The angular velocity increases.
In the Planetary Motion diagram, what force is responsible for the conservation of angular momentum?
Gravitational force.