A “blink of an eye” is a time interval of about 150 ms for an average adult. The “closure” portion of the blink takes only about 55 ms. Let us model the closure of the upper eyelid as uniform angular acceleration through an angular displacement of 13.6°. (a) What is the value of the angular acceleration the eyelid undergoes while closing? (b)What is the tangential acceleration of the edge of the eyelid while closing if the radius of the eyeball is 1.25 cm?
Angular speed, acceleration and displacement
Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.
Angular Position
Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.
A “blink of an eye” is a time interval of about 150 ms for an average adult. The “closure” portion of the blink takes only about 55 ms. Let us model the closure of the upper eyelid as uniform
(a) What is the value of the angular acceleration the eyelid undergoes while closing?
(b)What is the tangential acceleration of the edge of the eyelid while closing if the radius of the eyeball is 1.25 cm?
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