P4 Flashcards
What happens when two insulating materials are rubbed together?
Electrons are scraped from one to the other.
What charge does an electron have?
Negative
The charge of the parts afterwards are decided by what?
It depends on what the materials are E.g Acetate is positive.
How are the charges produced?
Both positive and negative charges are produced by the movement of electrons.
What sub atomic particles move?
The electrons only.
What would happen if two negative charged objects were brought near to each other?
They would repel becuase parts with negative charges repel.
If a positive and negative objects were bought towards each other, what would happen?
They would be attracted to each other becuase opposites attract.
What are charged atoms or molecules called?
Ions
What happens with static electricity and dust?
Dust particles will be charged and attracted to objects with opposite charges which are predominantly insulators which household objects are made out of so they would stick together.
What happens with static and clothes?
Synthetic clothes being dragged over each other causes a charge to be induced and so when touched produces a shock.
What happens with static and door handles?
When wearing shoes with insulating soles, the charge builds up. The person then touched a metal water pipe or handle and it is discharged which causes the shock.
What can happen if a static charge is built up?
The charge can continue growing until it is large enough to make a spark that can ignite gases and fuel fumes.
What is earthing?
Connecting a charged object to the ground so that it provides the easiest route for the static to discharge therefore it can not build up.
Name some examples of earthing.
Fuel tankers- prevent sparks that could cause the fuel to explode.
