E-Activity 14

1. Combing your hair can produce static electricity.
(a) Why does this happen?
(b) Write down two ways in which you can tell when it happens.
2. Copy the sentences. Then use the words attract and repel to complete them.
Two charged strips made from the same plastic __________each other.
A charged polythene strip and a charged acetate strip ______________ each other.
Both charged strips will also ___________ light objects that do not have a charge.
Charged objects sometimes attract and sometimes repel. This means that there must be different types of electrical charge.
3. Copy and complete the sentences.
Objects that have the __________ type of electrical charge repel each other. So if two charged objects attract each other they must have ___________ electrical charges.
4. You can use an electrostatic machine to make hair really stand on end. Explain how this happens, as fully as you can.