Using our Waterplay Sink or Float Balls, children can play, experiment, and discover why objects float and sink in water.
Why Do Objects Sink or Float?
Weight: The weight of an object is the measure of gravitational force acting on that object. Heavy objects sink, and lighter objects float
Buoyancy: The buoyancy of an object placed in liquid measures the upward force of the liquid acting on that object. When the upward force acting on an object in liquid is greater than the downward force of gravity (or its weight), the object floats, and vice versa.
Density: Objects denser than water will sink, and objects less dense than water will float.
To simplify the language for little ones use simple language such as “heavy” and “light”.
Observe how the ball floats at first and starts sinking once the holes at the bottom fill the ball with water inside.