1. Aug 22, 2013

PsychonautQQ

1. The problem statement, all variables and given/known data
http://grephysics.net/ans/0177/23

The answer to this problem is confusing me.
So you can calculate the normal acceleration and tangential acceleration to each by equal and 90° apart from each other, so their final vector has an angel of 45°. However, if the speed travels in the same direction as the tangential acceleration, wouldn't the angel between the TOTAL acceleration vector and the velocity vector be 22.5° ?

2. Aug 22, 2013

vela

Staff Emeritus
No, how'd you come up with 22.5 degrees? Try drawing a picture.

3. Aug 22, 2013

PsychonautQQ

because the total acceleration vector is at a 45 degree angel, and the velocity vector would be on an axis, so wouldn't between them be 22.5?

4. Aug 22, 2013

verty

Speed is a scalar, it doesn't have direction. It is the velocity's magnitude and measures how quickly the particle is moving regardless of the direction of travel.

5. Aug 22, 2013

vela

Staff Emeritus
No, it wouldn't. Did you draw a picture? What's the angle between the tangential acceleration and the velocity?

6. Aug 22, 2013

PsychonautQQ

0? Arn't they the same?