If we want to describe work, we must have (a) an action which causes no movement or reaction. (b)a force and a movement in the opposite direction of the force.(c) a force and a movement in the same direction as the force. (d)an action which causes movement and an opposite reaction.

The correct answer is C because why would you want to move the force away from the force. So therefore the answer C because you want to move the force to the force. Hope This Helps

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

there are no contact forces mentioned on the list of choices that you've provided.