Question

Physics: Velocity and acceleration vectors.

Answer 1

I'm guessing it's changing in both cases

Answer 2

changing direction*

Answer 3

In first acceleration is in opposite direction to velocity so velocity decrease
And in second case acceleration is perpendicular to velocity so it changes it direction towards right.

Answer 4

yes, unless the acceleration "lines up" with the velocity, you will change direction.
that means both pictures show a change in direction

Answer 5

So every time acceleration vector is opposite, it means the velocity is decreasing?

Answer 6

in the first figure, a part of the acceleration is opposite the velocity (i.e. slowing down)
and part is acting to change direction to the right

Answer 7

in the second figure, the acceleration is not slowing down the velocity to the right
it is adding velocity straight down.
if you don't slow down (to the right), but add some down velocity
the total velocity increases.

so you are speeding up in the 2nd figure, and changing direction to the right.