Education & Development
Float or sink?: Explore your child’s ideas about the physical world
...concept of ‘light for size’, recognising another important aspect is the shape of the object. At some point, children realise that there are different sorts of floating. If you used a CD or managed to float a needle, for example, you probably found the idea that ‘it stays down once it’s sunk’ is different from ‘it comes up again if it’s pushed down’....