Floating and sinking

Worksheets and lesson ideas to challenge students aged 11 to 16 to think hard about floating, sinking and upthrust (GCSE and Key Stage 3)

Heavy objects sink, light objects float – right? You can have lots of fun teaching students about why objects float and the opportunity to address many of their  prior conceptions. This demonstration below is a great way to set up some cognitive dissonance with some heavier objects  floating! Click here for some other lovely demonstrations on floating and sinking.   


  1. Air resistance
  2. Floating and sinking
  3. Moments
  4. Newton’s laws of motion
  5. Pressure
  6. Weight, gravity and free fall