- #1

brendan3eb

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## Homework Statement

Imagine a car driving on the XY plane in the +y-direction. If it is slowing down, in what direction is the angular acceleration of the wheels?

(a) the +x-direction

(b) the -x-direction

(c) the +y-direction

(d) the -y-direction

(e) the +z-direction

## Homework Equations

a=αR

## The Attempt at a Solution

I am just really lost when it comes to this problem. The apparent answer is A, but I do not understand why. I can't conceptualize angular acceleration with the axes..

The solution says the wheels have an angular velocity in the -x-direction and thus since the angular velocity is decreased the acceleration would be in the +x-direction. I get the second step, but I don't understand how you determine the angular velocity is in the -x-direction

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