Inertia

• What is the moment of inertia for an isolated point mass

  A measure of how difficult is is to alter an objects rotational speed: I=mr^2
• What is the moment of inertia of an extended object

  I = sum of mr^2
• If a small mass (m) is added to a rod at radius (r) from the axis of rotation, what is the new moment of inertia

  I (new) = I (initial) + mr^2
• What affects the moment of inertia of a rotating object?

  • The mass and mass distribution of the object
  • The position of the axis of rotation
  • How far away the mass is from it
• What is Torque

  A measure of how much a force causes an object to rotate about an axis (N/m)