Electric field lines never form closed loops; conservative
New cards
4
Can you have a repulsive force when it comes to gravitation?
Gravitation is attractive, electric forces are repulsive
New cards
5
Like charges do what?
Like charges repel each other
New cards
6
Charging by bringing a charged conductor near another charged object and then grounding the conductor is called what?
induction
New cards
7
Charging by contacting a charged object with a neutral object is called?
conduction
New cards
8
Do electric field lines ever cross each other?
electric field lines cannot cross
New cards
9
Do protons and neutrons attract or repel?
attract
New cards
10
Electric field strength depends on what?
charge and distance
New cards
11
If an object becomes positively charged the other object it was in contact with becomes what?
negatively charged (gains electrons)
New cards
12
If charge is tripled for both point charges how does that affect the electric force between two point charges?
electric forces if 9X
New cards
13
If distance between two objects goes from 20 m to 10 m how does that affect the gravitational force between the objects?
gravitational force increases (gravitational force is inversely proportional to the square of the separation distance between the two interacting objects)
New cards
14
If distance is tripled how does that affect the gravitational force between two objects?
gravitational attraction is decreased by a factor of 9
New cards
15
If two point charges are 3 m apart and are moved to a distance of 15 m apart what factor does the electric force between them change?
idk
New cards
16
Is the electric force between charges stronger when they are close together or far apart?
close together
New cards
17
Repelling forces have what kind of signs?
unlike charges
New cards
18
Removing the excess charge on an object by means of the transfer of electrons between it and another object of substantial size is called?
grounding
New cards
19
The force that the Earth exerts on the moon is \_____ compared to the force that the moon exerts on Earth.
equal
New cards
20
The gravitational force that Earth exerts on an object is called what?
weight
New cards
21
What happens when a glass rod is rubbed with silk?
rod becomes positively charged (electrons are removed from the rod), silk becomes negatively charged
New cards
22
What is it called when the opposite charges separate within an object?
polarization
New cards
23
What is the charge of an electron?
negative charge
New cards
24
What relationship does the distance between two objects have to the gravitational force between them?
inversely proportional to the square of the distance between the two objects.
New cards
25
What relationship does the mass of an object have to the gravitational force between two objects?
directly proportional to the masses of the two objects
New cards
26
What types of materials are electric charges easily transferred in?
conductors (metals)
New cards
27
When the distance between two charges is halved, the electrical force between the charges?
the force between the two charges is quadrupled
New cards
28
Where do you measure distance from when looking at the gravitational force between objects?
measure from centers
New cards
29
Why does an astronaut weigh less on the moon than on Earth?
less gravitational strength on the moon than Earth
New cards
30
What happens when you have like poles in a magnet?
repel each other
New cards
31
Where is the magnetic field around a permanent magnet greatest?
greatest at poles
New cards
32
In a magnetized object, how are the domains arranged?
same direction (magnetized)
New cards
33
All magnetism is created by what source?
motion of electric charges
New cards
34
What surrounds moving electrons?
an electric field and a magnetic field
New cards
35
If you put a north pole and a south pole together what will happen?
pull together (attract)
New cards
36
What happens when you break a bar magnet in half?
If you break a bar magnet in half, each half results in a smaller bar magnet with north and south ends.
New cards
37
Is the magnetic field strong when it is close to or far away from a magnet?
closer, stronger
New cards
38
What are magnetic domains?
magnetic fields of atoms are grouped together and aligned.
New cards
39
How are magnetic field lines drawn?
Magnetic field lines can be drawn by moving a small compass from point to point around a magnet.
New cards
40
How can electric current be induced in a wire?
moving a magnet up and down near the wire
New cards
41
What is electromagnetic induction?
The phenomenon of inducing voltage by changing the magnetic field around a conductor
New cards
42
What is the left hand rule?
find the direction of force/motion of the conductor in an electric motor when the magnetic field direction and the current direction are known.
New cards
43
What is the right hand rule?
The same thing as left hand rule just with right hand and works best with electric generators.
New cards
44
What is the difference between electric generators and electric motors?
An electric motor converts electricity into mechanical energy, providing a power source for machinery. A generator does the opposite of this, converting mechanical energy into electricity.
New cards
45
According to Newton's laws, a rock and a pebble will fall with the same acceleration in a gravitational field because the gravitational force on each is what?
Studied by 0 people
