1.2 Charges can move from one place to another
Q1. Materials that has been charged by contact doesn't stay charged forever. For instance,your hair sticks to the balloon right afger you charge it by rubbing it to your hair. But after a while, you put the balloon on your head on nothing happens. Can you explain this?
Q2. Imagine you are an electron inside a negatively charged ****l ball. One time, you are 1/5R away from the center. The second time, you find your self 1/3R away from the center. Compare the forces you feel.
1.3 Electric current is a flow of charge
Q1.
1. After static charges build up, it can move to a new ********. This is called 'a static discharge'. So a static discharge should happen to the balloon and your hair. The balloon is made of rubber, which is an insulator, and can let a charge pass through them, but not that easily. So it doesn't easily let a charge to pass through it, and I think maybe it can spread to other places, including dry air and any conductors around, which makes your hair lose that static charges.
2. My guess is that when you are 1/5R away from the center, you are closer to the center than when you are 1/3R away from the center, so the force you feel will be bigger.(I mean when the force is big enough for you to feel, and you are extra-sensitive to compare the two forces.)