Year 5 Teachers


Apple Science Activity 4

Sink or swim?

Carry out the floating test to find out whether the apple and other items will sink or swim. Before the test see if you can say what you think will happen.

You will need

  • Large bowl full of water (or use a sink)
  • Objects to test: choose at least 5 objects using a combination of solid and hollow items and objects made from different materials e.g. tennis ball, modelling clay, a carrot, a golf ball, a Bramley apple.

Were you correct in your guesses?

Why do you think some objects floated whilst some sank to the bottom?


Whether objects float or sink will depend upon their density: how tightly packed together the material inside it is. Metal ships are very heavy, but they are hollow (e.g. not very dense) and therefore float