Angular Motion Terminology

• Angular Distance 


  the sum of all angles through which it moves in it's passage from initial to final position. measured in degrees. e.g. in image = 150 degrees

  
• Angular Displacement 


  is equal to the angle between the initial and final positions of the body. Measured in degrees. e.g. in image = 40 degrees
• Angular distance/displacement 


  -          baseballer rotates their bat through an angular displacement to generate velocity ready for impact with the ball.

  -          To increase the angular displacement of the bat, one must increase the range of motion by either;

  1.      Taking the bat back further in the backswing

  2.     Increasing the length of the lever (can occur by using a longer striking implement or gripping it at the end)
• as can be seen in the image, the distal end (L2) of the lever travels a greater angular displacement than the proximal (L1) part of the lever.

  
• Angular Velocity (ώ) 


  Angular velocity is a measure of how quickly an object rotates or revolves around a central point or axis. It describes the rate at which the angle (in radians) changes with respect to time. In simpler terms, it's how fast something is spinning.
• The moment of inertia decreases as the distance of the mass from the axis of rotation decreases
• The moment of inertia increases as the mass of the object increases
• Moment of Inertia 


  is a body's reluctance when rotated