Lecture 14

Question 1

The area below a Force time graph is

Answer 1

Impulse

Question 2

What is angular inertia

What happens if it increases

Answer 2

The property of an object to resist changes in its angular motion

If angular inertia increased, it is more difficult to speed up or slow down the rotation

Question 3

Angular inertia is affected by

Answer 3

The mass of an object

How the mass is distributed relative to the axis of rotation of an object

Question 4

What is easier to spin

Bottle in the middle or on the ends

Answer 4

Bottle in the middle is easier

Question 5

What is moment of inertia

What is the equation

Answer 5

The quantity that describes angular inertia

I = mk^2

k = radius of gyration about axis through the center of gravity

Question 6

What is the radius of gyration

Answer 6

The distance from the axis of rotation at which the total mass of a body is assumed concentrated and at which to create the same resistance to change in angular motion as the actual body

Question 7

How do you work out the moment of Inertia when the axis moves from the central axis

Answer 7

Ia = Ic + md^2