Why does a block of plastic released under water come up to the surface of water?


When an plastic is immersed in water, there are two forces acting upon it

  • Gravitational force in downward direction
  • Buoyant force in upward direction


In this case,

the buoyant force on plastic is more than the gravitational force.

Thus, plastic will come up to the surface of water.

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.