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Gravity- or for some things, magnetism.
Friction does not move things. Friction is the force that opposes motion between two objects that are touching. Not enough friction allows for things to move, depending on what kind of friction; the less force it has.
Friction force. [opposite force]
rotator
It is contact force
It is changing force
Gravity- or for some things, magnetism.
i dont know
the two things that effect air pressure is force and area
Friction does not move things. Friction is the force that opposes motion between two objects that are touching. Not enough friction allows for things to move, depending on what kind of friction; the less force it has.
Contact Force
the force that opposes the motion of two touching surfaces is velocity.
Friction force. [opposite force]
Friction force. [opposite force]
Friction is a force that acts to stop the movement of two touching things. The energy lost to friction is turned into sound and heat.
rotator
they must be touching