Magnets
The three items that magnets attract include:
Iron, Nickle, and Cobalt
What is the force between charged objects?
Electric Force
The law of universal gravitation says that all objects in the universe attract each other through gravitational force.
Therefore, the size of the force depends on what two things?
Mass of the object and the distance between the objects.
This thing uses attractive and repulsive forces between wires and magnets to create movement in the wire.
Motor
A push or a pull
Force
This is where magnets are the strongest
The poles
The greater the chargers, the __________ the electric force is between the objects.
The closer together the charges are, the _______ electric force is between the objects. (2 answers)
1) greater
2) greater
What is gravity?
A force of attraction between objects that is due to their masses.
What transforms mechanical kinetic energy into electrical energy by moving a wire through a magnetic field?
Generator
A device that converts mechanical energy into electricity.
Electric generators
What happens if a magnet is broken in two
What is Friction
Charging an object by rubbing two things together
If air resistance didn't exist and we dropped an elephant and a feather from the top of a very tall building which would hit the ground first?
They'd hit at the same time.
What is current?
What are the two types of currents?
Flow of charges
AC and DC (alternating current and direct current)
A device that converts electricity into mechanical energy
Electric motor
In magnets the domains are arranged this way.
In a line, orderly, neatly, etc.
What is the difference between conduction and induction?
Conduction is charging an object through direct contact and induction is charging an object through indirect contact.
Gravitational force increases as mass does what
increases
This is a temporary magnet that is composed of a coiling wire (called a solenoid) around a metal core and a current passing through the wire.
Electromagnets
The presence and/or flow of electric charges
Electricity
List 3 ways to demagnetize a magnet and 1 way to make a magnets stronger (6 answers)
1) Dropping the magnet
2) Put the magnet in a strong magnetic field
3) Increase the temperature
1) Freezing it
What is the difference between conductors and insulators?
Conductors allow the flow of charges and insulators restrict the flow of charges
The gravitational force increases as the distance between objects does what?
Decreases
What are the three ways to increase the strength of an electromagnet.
1) increase the number of coils in the solenoid
2) increase the size of the core
3) increase the amount of current (bigger battery)
Build up of electric charge in an object
static electricty