this record player provides a good example of the differences between tangetal velocity and angular velocity as well as the difference between their respective accelerations. when i start the record player, if i track the positions of two different points on the record at different radii, i find that they rotate around the axis at the same time intervals, meaning they cover the same amount of angular displacement no matter where that spot is. however, it is apparent that the different spots have different speeds. this is the tangental velocity. if i just focus at one spot, i only see a marked point on the record pass my eyes in an instant, when it is attmpting to go forward, yet is being held in a circlular movemnt by centripetal force. this instantaneous velocity is measured in meters per second, not by angular displacement and is thus a differnt speed at different radii.
