Vocabulary
What is the difference between ionic and distilled water?
Ionic: has ions dissolved in it (e.g Na+, Cl-, K+)
Distilled: has no ions or anything else dissolved - it is just H2O
When rubber and wool are rubbed together, which becomes - and which becomes +?
wool = +
rubber = -
A positive glass rod touches a neutral metal leaf electroscope. Now the rod is taken away. Do the metal leaves stay separated or not when the glass rod is removed?
They stay separated because the overall charge of the electroscope is now positive so the leaves will repel each other.
it bends the water towards the balloon because the +++++ charges in the water are attracted to the - - - - - charges of the balloon.
a) friction
b) conduction
d) induction
a) friction
What is friction?
a type of thermal energy
What is one thing you can rub with wood to give it the wood a negative charge?
steel, cotton, paper, silk, aluminum, cat fur, wool, human hair, glass, rabbit fur, dry skin
A neutral pith ball becomes negative when it is touched by an object. What was the charge of the object that touched it?
it was negative - both objects have the same charge in the end so since the pith ball became negative, it means the object that touched it was also negative
True or false: when an object is charged by induction it must be touched by the other object.
false - that would be called charging by contact/ conduction then.
Which of these will be the MOST POSITIVE when rubbed with rubber
a) teflon
b) silk
c) glass
c) glass
What is lightning?
the electric discharge of electrons (high voltage) from the cloud to the ground or adjacent clouds
*This is a type of static electricity
What is one thing you can rub silk on to give the silk a positive charge?
paper, cotton, steel, wood, rubber, polyethylene, teflon
A positive glass rod touches a meta leaf electroscope. What will be the resulting charge of the metal leaf electroscope?
it will be positive since some electrons from it will leave to move to the glass rod. The leaves will push apart now because they repel each other.
Look at the diagram given to you. Draw + and - on the objects to show what happens.
See pic.
Which of these will be the MOST negative when rubbed with human hair?
a) silk
b) teflon
c) polyethylene
b) teflon
What is the difference between an insulator and a conductor?
Insulator: objects that have tightly bound electrons that won’t readily jump to other atoms; does not easily allow free flow of e-
Conductor: objects that have loosely bound outer electrons which can easily flow between molecules; objects that easily allow the flow of electrons
Which 2 things when rubbed together will have a greater charge difference?
a) steel and silk
b) polyethylene and rabbit fur
b) polyethylene and rabbit fur
What happens when a negative balloon is touched to a pith ball? Draw a diagram.
The e- from the balloon will go into the pith ball and now they are both negative and the balloon will repel the pith ball.
A glass rod is rubbed on some silk and is brought close to a pith ball. The pith ball moves towards the glass rod but never touches it. What is the overall charge of the pith ball?
it is neutral
What 2 things, when rubbed together, will give the greatest charge difference between them?
teflon and dry skin because they are the furthest apart on the triboelectric series
What is the difference between static electricity and current electricity?
Static: the accumulation of e-; an imbalance of electric charge on the surface of an object. The charge remains until it can move away by electrical current or electric discharge (grounding).
Current: the movement or flow of e-
When 2 items are rubbed together, do they end up with the same charges as each other or opposite?
opposite - one becomes + and one becomes -
is grounding an example of charging by contact/ conduction? Explain why or why not
no - when objects are charged by contact, they end up with the same charge (both - or both +). In grounding, the object that is being grounded becomes neutralized.
A balloon is rubbed on some cat fur and is brought close to a pith ball. What happens to the pith ball?
The balloon would become negative when rubbed with cat fur so now it will attract the +++++ charges in the pith ball, so the pith ball moves towards the balloon.
list 2 things that when they are rubbed together, give each object a very weak charge
answers may vary