Which of the following statements about the force of friction is true?

A. Friction acts in the direction opposite to weight.
B. Friction acts in the same direction as the normal force.
C. Friction acts in the direction opposite to an object's motion.
D. Friction acts in the same direction as weight.

Question

Which of the following statements about the force of friction is true?

 		A.	Friction acts in the direction opposite to weight.
 		B.	Friction acts in the same direction as the normal force.
 		C.	Friction acts in the direction opposite to an object's motion.
 		D.	Friction acts in the same direction as weight.

anonymous · Answer

which do you think it is?  or which do you think we can scratch out because it's not it?

anonymous · Answer

I think it's C. 
Is that correct?  
@DemolisionWolf

anonymous · Answer

^_^  you are right!

anonymous · Answer

friction ONLY 'exists' when there is motion.
technically, there everything will have friction, but we only 'see it' when things are moving. ^_^