Ukuran huruf
Lembar kerjaMagnets anad electric forces
Total soal: 48
Worksheet time: 45mins
Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?
The balloon and hair both have positive charges
The balloon and the hair both have negative charges
The balloon and the hair both have neutral charges
The balloon and the hair both have opposite charges
Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?
The poles facing one another are both south poles
The poles facing one another are both north poles
The poles facing one another are opposite poles
One magnet was bigger than the other
Surrounding each magnetic is an invisible force field called
Gravity
A magnetic field
An electric field
The Force
Two magnets pull on each other. What can make the magnets pull with LESS force?
Add heat to one magnet.
Use two stronger magnets.
Turn both magnets around.
Move magnets farther apart.
The Law of Electric Forces states that opposite charges __________ and like charges ______________.
repel , attract
attract , repel
attract , attract
I do not know and do not want to guess.
Electric charges that do not move through a current are known as ____________.
Magnetic
Electric
Electromagnetism
Static Electricity
The area around an electric charge that experiences the force exerted by the electric
charge.
Electric Field
Electric Force
Electric Poles
Electric charge
The two types of charges in electric and magnetic forces are __________ and __________. (Select 2)
positive
negative
neutral
20.When your hair stands on end each strand repelling the other, you are experiencing
______________ _________________.
current electricity
static electricity
magnetism
the negative charges in the blue circle will .......the positive charges in the red circle
repel
attract
nothing happens
when the number of the negative charges and positive charges are the same ,the object is ..........
Negatively charged
positively charged
Neutral
in a............electrical charges can move easily
insulator
conductor
nothing
in an...........electrical charges cannot move easily
conductor
insulator
nothing
Electric force is a ............force
Contact
non contact force
both
When you walk across a carpet in socks, they pick up charges. Later, there aren't any charges in your socks. what probably happened to the charges?
The charges disappeared.
The charges switched signs.
The charges transferred to another object.
The charges broke apart into smaller particles.
A repelling force occurs between two charged objects when the charges of are of __________.
like signs
unlike signs
equal magnitude
unequal magnitude
An attracting force occurs between two charged objects when the charges are of _______________.
like signs
unlike signs
equal magnitude
unequal magnitude
The ___________ _____________ is the force of attraction or repulsion between objects due to their charges.
electric charge
electric force
distance
variable
glass, rubber, silk, and plastic are all examples of
Conductors
Insulator
Thermel conductivity
Materials
A repelling force occurs between two charged objects when the charges of are of __________.
like signs
unlike signs
equal magnitude
unequal magnitude
An attracting force occurs between two charged objects when the charges are of _______________.
like signs
unlike signs
equal magnitude
unequal magnitude
When you rub a neutral balloon on neutral carpet, the balloon will attract hair. What happened to the electric charge of the balloon?
Nothing, the hair's charge changed.
The charge of the balloon changed.
It became opposite.
It stays neutral.
What is an electric charge?
A physical property that results in static electricity.
The attraction and repulsion of objects.
Something you plug in.
A constant state.
In a stable atom the amount of electrons is equal to
neutrons
protons
atomic mass
neutrons + protons
What variable do "newtons" represent?
Electrostatic Charge
Force
Distance
Mass
An electric field causes any charged particle in it to experience an electric force.
True
False
When a material does not permit an easy flow of electrons through it, this can be classified as...
conductor
insulator
semiconductor
superconductor
What is an electric charge?
A physical property that results in static electricity.
The attraction and repulsion of objects.
Something you plug in.
A constant state.
The ___________ _____________ is the force of attraction or repulsion between objects due to their charges.
electric charge
electric force
distance
variable
A physical property of matter that moves through wires and causes static electricity.
conservation of a charge
a circuit
electric charge
positive and negative
