- #1

- 116

- 15

I can not understand why ##v_x = -|v|sin(θ)## and ##v_y = |v|cos(θ)##

I'm asking about the θ angle. If i move the vector v with my mind to the origin

i get that the angle between x'x and the vector in anti clock wise, it's 90+θ not just θ. So why is he using just θ? Does the minus in v_x somehow make the result the same when using just θ?

Also I thought that sin goes with the v_y and cos goes with v_x not the opposite...