On an inclined plane, how does a larger angle of inclination result in a faster speed?

Question

I tried working this out by myself using different values for the angle of incline and the same weight - which was just 100N. I found that the frictional force was equal to the force acting down the slope each time. I thought that if those forces balanced each other, the object would be at rest, which obviously won't be happening on an incline.

I also have to use tan(theta) to find the co-efficent of friction.