What happens to the balance when a heavier object is placed on it?

When a heavier object is placed on a balance scale, it exerts a greater force due to gravity, which results in an imbalance. This force is greater than what was previously on the opposite side of the balance, causing the side with the heavier object to descend. As a result, the other side of the balance rises. This occurs because the balance operates on the principle of equilibrium—when one side experiences a greater downward force, the system shifts to restore balance, leading to a visible movement where the side with the heavier object moves lower.

This principle is fundamental in understanding how balance scales measure weight. The other options do not accurately describe the mechanics of a balance scale in this scenario. The balance does not remain unchanged, nor does it exert equal force; it clearly reacts to the difference in weight applied. Additionally, the scale is designed to support greater weights without breaking, so it is structured to endure such changes within its specified limits.