Key Terms and Conepts Center of Gravity Rotational Equilibrium Stable Equilibrium Unstable Equilibrium Metastable Equilibrium Define center of gravity, support base, and normal force.[2] Compare the r...Key Terms and Conepts Center of Gravity Rotational Equilibrium Stable Equilibrium Unstable Equilibrium Metastable Equilibrium Define center of gravity, support base, and normal force.[2] Compare the relative torque applied to objects by various forces.[2] State the conditions for static equilibrium.[2] Compare and contrast stable, unstable, and metastable equilibrium.[2] Apply center of gravity, support base, and metastable equilibrium concepts to compare the stability of various structures.[2]