A sled going downhill is pulled towards a lower point on the ground due to this force.
What is gravity?
What is an electron?
What is attraction?
In order to turn on a light bulb in a circuit, the circuit must be this.
What is a closed circuit?
These both show attractive properties when they are opposite
What is magnetism and electric force?
These two factors affect the strength of gravitational force.
What is mass & distance?
Like charges at an atomic level will do this.
What is repel?
The two magnets below the paper filled with iron filings have these two poles facing one another.
What are opposite poles? What are North to South poles?
An incomplete circuit is sometimes called this.
What is an open circuit?
These are all considered non-contact forces
What is gravity, electric force and magnetism?
A truck will have more gravitational force than a small car due to this factor.
What is larger mass?
If you rub a balloon on your head, then bring the balloon up to a wall, this happens due to these electric charges.
What is attraction due to opposite charges?
This phenomena is being shown in this picture of two magnets being brought together.
What are like poles repelling?
(north to north or south to south poles repelling)
Aluminum, steel, gold, copper are all considered this.
What is a conductor?
These are all dependent upon the distance between objects?
What is magnetism, electric force and gravity?
Two objects with more mass and less distance between them will have this effect on gravitational force.
What is increased gravitational force?
A positive charge dropped into this field would do this.

What is travel right towards the negative charge?
A compass reacts to the presence of magnets, current and the north pole, because the pointer on the needle within the compass is this.
What is magnetic (a magnet)?
These materials prevent the transfer of electric charges.
What is an insulator?
Increasing the amount and type of ferrous material present would do this?
What is increasing magnetic field?
A man has the same mass but less weight when he travels to the moon due to this change in this specific force.
What is less gravitational force?
Power lines can interfere with a compass even though they are not touching because electric force is considered this.
What is a non-contact force?
A maglev train works on this principle.
What is levitation?
or
How can opposite magnetic poles make one magnet "float" above another.
What is the energy source?
This field surrounds the earth and protects us from charged particles emitted from the sun.
What is the magnetosphere (Earth's magnetic field)?