A single curve cannot touch "each other" since "each other" implies two curves.
friction
two lines that do not touch each other
Two south poles on two magnets will repel each other. A north and a south pole on two magnets will attract each other.
Friction.
Sparks
who cares!! :P
Conduction
Two positive charges will repel each other from a distance due to the electric force between them. They do not have to touch in order to feel the repulsive force. This repulsion is a fundamental property of electric charges.
On a Home Run, the runner is still required to touch all bases, even if he is entitled a run. If he misses any base, including Home Plate, and makes no attempt to return to the base to touch it, he will be declared Out and his run does not score. If other runners are also running and touch all of the bases, their runs will score. If there are two outs with runners on, only the runners who crossed the plate before his run would score.
The concentration of heat caused by pans that touch each other is called what?
Conduction