My book says this:
Uniform Angular Acceleration
From Newton’s first law we know that an object moving in a circle must be acted upon
by a force causing it to continually change direction. Hence such an object must be
experiencing an acceleration. Just as we did for angular velocity, we will now derive an
expression for the angular acceleration.The first point to note is that the acceleration of an object moving in a circle is towards
the centre of the circle. Imagine a stone on a length of string being whirled around
your hand. Clearly, the force acting on the stone is supplied by the string and acts towards
the centre of the circle. The acceleration is in the same direction as the force, and can be
shown to be
V2
––
r
This formula gives the acceleration in metres per second2. (Test this by substituting units
into the equation.) To find the angular acceleration in radians per second2,
substitute for v from w = v/r
This yields:
Angular Acceleration = ω2rIs all that a load of rubbish then?
Going back to angular velocity for one moment:
the formula i was given is w=theta/t
How do i apply that to get the answer?
i checked that formula with this
http://eculator.com/formula/calculator.do?equation=Angular-Velocity&id=204
but i don't know what values to stick in the theta or time?
Thanks for your time and patience with this
I hate this course with a passion, not one word makes sense