Angle of Vector (`v_y, v

$phi = arctan( v_y / v_x )$

Enter a value for all fields

/attachments/b66de43b-88cf-11e4-a9fb-bc764e2038f2/Vector x-y components.png This equation computes the angle of a generic vector ^[¹^], $vecv$ , from the x and y components of the vector.

This equation is likewise represented in the x and y components of an instantaneous velocity vector ^[²^]

/attachments/b66de43b-88cf-11e4-a9fb-bc764e2038f2/Velocity vector components.png

^ Young, Hugh and Freeman, Roger. University Physics With Modern Physics. Addison-Wesley, 2008. 12th Edition, (ISBN-13: 978-0321500625 ISBN-10: 0321500628 ) Pg 17, eq 1.8
^ Young, Hugh and Freeman, Roger. University Physics With Modern Physics. Addison-Wesley, 2008. 12th Edition, (ISBN-13: 978-0321500625 ISBN-10: 0321500628 ) Pg 73, eq 3.7