- #1
harp AP 2010
- 30
- 0
Homework Statement
If I spin in circles, in place, am I accelerating?
Homework Equations
If acceleration is a change in velocity, which is a vector quantity, does only a change in direction count as acceleration?
yes. as DaleSpam said, there are certainly parts of you that don't fall directly on the axis of rotation, and those parts of you have a non-zero speed that is constantly changing direction. therefore your velocity is constantly changing, i.e. you are accelerating. how to treat the infinitesimal part of you that actually falls directly on the axis of rotation i don't know...harp AP 2010 said:If I spin in circles, in place, am I accelerating?
yes. a velocity is a speed AND a direction - if either or both characteristics are changing, then velocity is changing, and therefore an acceleration is present. think about a turn table spinning a record at constant angular speed. if you choose any random point on the surface of the record (not including its center), it will rotate about the centerpoint at some constant angular speed, depending on its distance from the center. but despite having a constant speed, its direction is NOT constant. in fact its direction is continually changing, and so long as the angular speed of the record remains constant, so does the rate at which the point's direction changes as it rotates about the center of the record. if the rate at which the point's direction changes is constant, then the rate at which velocity changes is also constant, resulting in a constant centripidal acceleration (a constant acceleration toward the center of the record).harp AP 2010 said:If acceleration is a change in velocity, which is a vector quantity, does only a change in direction count as acceleration?
Acceleration is the change in velocity over time. When you spin in circles, your velocity is constantly changing direction, thus you are accelerating.
Spinning in circles is considered angular acceleration because it involves a change in direction, rather than a change in speed in a straight line.
Yes, the speed at which you are spinning will affect the amount of acceleration. The faster you spin, the greater the change in velocity and thus the greater the acceleration.
No, the direction of spinning does not affect the acceleration. The change in velocity is the same regardless of whether you are spinning clockwise or counterclockwise.
The radius of the circle being spun does not directly affect the amount of acceleration. However, a larger radius will result in a greater distance traveled in a single rotation, thus potentially increasing the overall acceleration over time.