Why does an object float or sink when placed on the surface of water?

Explanation

When the object has density less than `1gcm^(-3)`, then it floats on the surface of water, because , it always displaces water having weight more than its own weight. As buoyant force is more than its own weight, therefore it floats. When the object has density more than `1gcm^(-3)`, then it sinks in water, because it always displaces water having weight less than its own weight. As buoyant force is less than its own weight ,therefore , it sinks.