Sinking of an ship due to unbalanced forces. An object sinks in water due to the unbalance between the upthrust and the gravitational force. Objects float in the water at balanced force conditions.
For example:
Hanging objects. The forces on this hanging crate are equal in size but act in opposite directions.
Floating in water. Objects float in water when their weight is balanced by the upthrust from the water.
Standing on the ground.
