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Friction force. [opposite force]
трение (friction)
Friction.
Frictional force exist between two moving objects that make it hard for them to move.Frictional force causes objects to slow down if force is not applied continuously to the moving objects. Frictional force causes some of the energy to be converted into the wasteful form of energy.
friction
Friction force. [opposite force]
Friction force. [opposite force]
трение (friction)
Friction force. [opposite force]
Friction.
Frictional force exist between two moving objects that make it hard for them to move.Frictional force causes objects to slow down if force is not applied continuously to the moving objects. Frictional force causes some of the energy to be converted into the wasteful form of energy.
Friction
friction
It could be electromagnetic attraction (or repulsion).
http://www.youtube.com/watch?v=psuRGfAaju4
There are three types of forces that act between objects that are not in contact. They are gravitational force, magnetic force, and electrical force.
Because it's not necessary for objects to be in contact (touching) in order to feel the magnetic force between them.