I'm confused - getting different answers from different places. During uniform circular motion, I know speed is constant, but what about velocity, acceleration angular acceleration? TBR says velocity is constant in terms of magnitude but not direction, which makes sense. What about the other 2 variables ^^?
Speed: constant
Velocity: changing because of changing direction
Acceleration: constant magnitude (it's a constant centripetal acceleration pointing in towards the center of the circle) but changing direction
Angular Acceleration: constant, and equal to 0
Angular acceleration is the change in the angular velocity. Angular velocity, measured in radians per second, or degrees per second is technically a pseduovector quantity but in MCAT problem solving you should just think of it as a scalar one. Just read "angular velocity" as "angular speed" and you'll be fine for the MCAT. So if something is going, say a constant 45 rpm then its angular speed would be (45*360) / 60 = 270 degrees per second. That's not changing so its angular acceleration is zero.
Hope this helps!
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Acceleration is changing. As you said, the acceleration vector points radially inwards, which means that its direction changes as the object traverses a circle.
