1. When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?
a. change the mass of your body
b. be ready to grab something in case you fall
c. change the center of gravity of your body and load
d. change the weight of your body and load

2. If you try to touch your toes while standing flat against a wall, you probably will fall over. The reason this happens is that
a. your center of gravity is not located directly above your support area
b. your center of gravity is outside your support area
c. both A and B