Cambridge Secondary (7-9). Stage 8. MCE Science. Student Book - Unit 4: The Structure of an Atom - Question 5

In the investigation, rub an inflated balloon against your hair, then bring it about 2.5 cm from an empty soda can lying on a smooth, level surface. Some electrons move from the hair to the balloon. Discuss these questions in groups.

How did the balloon cause the can to move?

Share your answers with the class.