angular momentum - lesson 6 & 7

Question 1

define angular momentum

Answer 1

The quantity of angular motion possessed by a rotating body

Question 2

what is the formula for angular momentum?

Answer 2

Angular momentum = angular velocity x moment of inertia

Question 3

what is angular velocity?

Answer 3

rotational velocity or speed of a rotating object

Question 4

define the moment of inertia

Answer 4

the resistance of a rotating object to change its state of motion
= mass x radius of rotation

Question 5

what happens when the mass is distributed close to the axis?

Answer 5

MOI is small and easier to rotate

Question 6

what happens when the mass of an object moves further away from the axis of rotation?

Answer 6

MOI increases and rotation becomes harder

Question 7

what happens when the mass of an object moves even further away from the axis of rotation?

Answer 7

MOI increases even further and rotation becomes harder again

Question 8

define the conservation of angular momentum

Answer 8

means that a spinning body will continuie spinning indefinitely unless an external force acts on it

Question 9

what are activitys where angular momentum is conserved and what does this mean?

Answer 9

• aerial skiing, diving, and performing a flip as pictured right
• sufficient angular momentum must be produced PRIOR to leaving the ground to ensure the athlete can complete the desired task.

Question 10

how can angular momentum be increased prior to taking off?

Answer 10

Increase linear momentum (run-up speed) which is then transferred into angular momentum
Apply a greater force to the ground/wall at take-off
Improve segmental interaction at take-off