stand with one arm and the side of one foot pressed against a wall. can u raise the other leg side ways?

Good question. But an experiment is worth a thousand theories. Have you experimented? Have you tried it? What happens? What forces, if any, did you feel? Which way, if any, were they acting?

Hint: Think of your one foot on the ground as a fulcrum and the weight of your raised leg acting over some radius between the raised leg and the foot.

Sure, if you want to fall down. You're shifting your center of mass with no compensating balance point.