There are three types of forces that act between objects that are not in contact. They are gravitational force, magnetic force, and electrical force.
There are many forces that exist between objects even in the absence of direct physical contact. Magnetism is one such force.
contact force
If there is a magnetic field.
a magenet
gravity
Friction force. [opposite force]
Friction.
трение (friction)
http://www.youtube.com/watch?v=psuRGfAaju4
Because it's not necessary for objects to be in contact (touching) in order to feel the magnetic force between them.
Friction force. [opposite force]
Friction force. [opposite force]
Friction force. [opposite force]
Friction.
трение (friction)
http://www.youtube.com/watch?v=psuRGfAaju4
It could be electromagnetic attraction (or repulsion).
Because it's not necessary for objects to be in contact (touching) in order to feel the magnetic force between them.
no
friction
The force of friction between their surfaces touching each other.
Electric Force is the force between charged objects.