science
What was Plutarchs Model? (100 AD)
the attraction of small bits of straw to rubbed amber was the result of the heated air that swirled around and pushed the straw to the amber
if you rub your hands together, what do you feel?
heat due to friction
what was john gilberts model? (1600)
the rubbed amber gave off an effluvium which emanated from the amber to nearby objects. The effluvium stuck to the object and pulled it back.
On ben franklins model, what is excess, deficit, and neutral?
excess- positively charged
deficit- negatively charged
neutral- balance of electrical fluid
using ben franklins model, explain the results of the tape experiment
one tape takes more electrical fluid form the other tape, so the top is positive and the bottom is negative
What was dufays model?
there are two kinds of electricity, vitreous- positive, and resinous- negative. neutral- equal amounts of fluid
what is the particle model?
there are two kinds of particles, positive and negative, if an object has more of one type of particle than another it becomes charged.
what model do we use today?
particle
what does discrete mean, and is it true?
single unit of charge, yes. there is no half of a charge
what are protons and electrons, and where are they?
protons- positively charged- central nucleus
electrons- negatively charged- orbital shells
what is a free electron?
an electron that can sneak off and is free to move, in the outer orbit. moves easily from atom to atom and by using a seperation of charges we can make these elctrons move. (conducting electricity)
whats in the central nucleus?
protons and neutrons
what does the moving in an atom
electrons
do all materials have positive and negative charges?
yes
how is an object neutral?
number of positive charges equals negative ones
what is matter made of?
atoms
explain the balloon model
both the balloon and hair start neutral, then the balloon turns neg and the hair pos because the electrons rubbed off onto the balloon. hair sticks up because the hair particles are repelling.
explain the wall model
when u bring the negative balloon to the neutral wall, the neg particles in the wall are repelled, and shift over, leaving the pos exposed. they then attract each other and it sticks.
can charge be created or destroyed?
no. charge is conserved
explain a solid object
pos charges are fixed, but negs are free to move (not all)
what happens when there is an excess of neg particles?
leaves a negatively charged body
what happens when there is a deficit of neg particles?
leaves a pos charged object
what is conductor vs insulator
conductor- material which charges move easily
insulator- material which charges do not move easily
explain attraction and repulsion
like charges repel, opposite charges attract
what is the triboelectric series?
the ability of a material to acquire or lose electrons
what is the third charge?
there is no third charge- no logical way
what happens during the tape activity?
t1 + b1- attract
t1 + b2 attract
t1 + t2- repel
b1 + t2- attract
b1 + b2- repel