Which statement is true for an object in stable equilibrium?

• A. All of the answers are correct
• B. The center of gravity will raise when tilted
• C. The center of gravity will remain at the same height when tilted
• D. The center of gravity will lower when tilted

Answer: (B)

In stable equilibrium, a small tilt causes the center of gravity to rise, which increases the gravitational potential energy and creates a restoring torque that nudges the object back toward its original, upright position. This rise in height during a slight displacement is what keeps the object balanced and prompts it to return to rest. If the center of gravity stayed at the same height when tilted, there would be no change in potential energy and no restoring force—neutral equilibrium. If tilting lowered the center of gravity, the tilt would be reinforced and the object would tip further away from its upright position—unstable equilibrium.