hair clipping through head

Hello, I’m pretty new to blender and I am trying to do a basic hair test. I pretty much created a sphere and added hair to the top with the particle system. Then I made a simple animation of the sphere moving in a strait line. My problem is the hair clips through what would be the forehead. How can I make the hair flow around the sphere instead of through it while it is moving?

Have you turned on collision for the emitter object?