angular motion

• angular motion

  when a body or part body moves in a circle or part circle
• a torque is a force which causes an object to turn about its axis of rotation
• torque (N/M) = force (N) X perpendicular distance from fulcrum (M)
• newtons first law in relation to angular motion

  a rotating body will continue with constant angular velocity until an external torque acts upon it
• newtons second law in relation to angular motion

  a body will angularly accelerate proportionally to the torque acting and in the direction of that torque
• what are the only two directions a torque can rotate an object?

  1. clockwise
  2. anti-clockwise
• newtons third law in relation to angular motion

  for every rotational reaction there is an equal and opposite rotational reaction
• angular displacement = angular velocity X time
• angular velocity = angular displacement / time
• angular acceleration = (final angular velocity - initial angular velocity) / time
• what force produces angular motion?

  eccentric
• what is torque measured in?

  newton/metres
• what is moment of inertia?

  resistance of a body to angular motion
• what does moment of inertia depend on?

  1. mass of body
  2. distribution of mass around axis
• a greater mass causes a greater moment of intertia
• the closer the mass is to the axis of rotation, the easier it is to turn as there is a low moment of inertia
• if the distribution of mass increases, the moment of inertia increases