Inertia and Angular Momentum Flashcards
Define moment of inertia.
It is a body’s resistance to change in its state of angular or rotational force.
What is the equation of moment of inertia?
Moment of inertia = radius of rotation x mass
What effect will bringing a person’s limbs closer to their body have on the moment of inertia and angular velocity?
The closer the mass is to the axis of rotation the lower the moment of inertia and the higher the angular velocity.
What effect will strecthing a person’s limbs away from their body have on the moment of inertia and angular velocity?
The further the mass is to the axis of rotation the higher the moment of inertia and the lower the angular velocity.
Define conservation of angular momentum.
Conservation of angular momentum means that a spinning body will continue to spin indefinitely unless an external force acts on it.
Draw a diagram illustrating conservation of angular momentum.
Check exercise book.
Define angular momentum.
Is the rotational or angular motion possessed by an object. The angular momentum of the body remains constant unless external forces act upon it.
What are 2 ways an individual could increase their angular momentum?
- Increase linear momentum (run-up speed) which is then transferred into angular momentum.
- Improve segmental interaction at take-off.
What is an example of where angular momentum is present?
A diver leaving a platform will conserve momentum in the flight of the dive until they enter the water where the external force of water acts to slow down.
What is a sporting example where angular momentum is present?
Figure skating.
Using figure skating as an example, describe the conservation of angular momentum.
Angular momentum is conserved from the time a skater applies an eccentric force to the ice to commence spinning to the time she makes contact with the ground to stop.
