pgs. 277 - 304

1
Chapter 8Rotational Equilibrium and Dynamics

• pgs. 277 - 304

2
Objectives

• Explain how moment of inertia affects rotational
  motion.
• Calculate the moment of inertia of various real
  world objects.

3
Rotation Inertia

• Center of Mass the point around which an object
  rotates if gravity is the only force acting on
  the object
• Rotational and translational motion can be
  combined

4
Moment of Inertia (I)

• Resistance of an object to changes in rotational
  motion
• Dependent on the mass of the object and how that
  mass is situated around the axis of rotation
• Units kgm2

5
Moment of Inertia
6

• What is the moment of inertia for a
  merry-go-round that has a mass of 525 kg and a
  radius of 2.00 m?

7

• What is the moment of inertia for a solid ball
  with a mass of 4.10 kg and a radius of 0.050 m?

8
Newtons 2nd Law for Rotation
9
Newtons 2nd Law for Rotation
10

• A potters wheel has a radius of 0.50 m and a
  mass of 100.0 kg. If the wheel comes to a stop
  with an angular acceleration of -0.87 rad/s2,
  what torque was applied?