Which of the following best describes friction in the context of newton's laws?

a. a force that opposes the relative motion of two objects in contact and sliding past each other.
b. an object's resistance to being accelerated by a force.
c. a force that is always in the direction opposite to the acceleration.
d. a kind of tape that holds things together

The best and most correct answer among the choices given by your question is the first choice or letter A. Sir Isaac Newton, best know for his famous Laws of Motion and Gravitation, described friction as "a force that opposes the relative motion of two objects in contact and sliding past each other." 

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