Negative charges can move from one place or object to another. There are three possibilities:
An object with an equal number of positive and negative charges has no overall charge, and we say that it is neutral.
An object that loses some negative charges ends up with more positive charges than negative charges, so it becomes positive overall.
An object that gains some negative charges ends up with more negative charges than positive charges, so it becomes negative overall.
Charges in neutral, positive and negative objects
Electrically charged objects like these have static electricity. We can give an object static electricity by rubbing it with something else made from a different material. This is what happens when we rub a party balloon on our hair. Negative charges move from our hair onto the balloon - our hair becomes positively charged and the balloon becomes negatively charged. Some weird things happen. We can stick the balloon to our hair, and our hair stands on end.
These things happen because:
Opposite charges attract - Our hair is positive and the balloon is negative, so they stick together.
Like charges repel - The strands of hair are positive, so they push each other away.
