Which is an action/reaction force pair? check all that apply. earth pulls on a book, and the book pushes against a shelf. a hockey stick hits a puck, and the puck pushes against the stick. a pencil pushes against a piece of paper, and the paper pushes against the desk. a finger pulls on a rubber band, and the rubber band pushes against the finger. a dog pulls on a leash, and the owner pulls back on the leash.

A hockey stick hits a puck, and the puck pushes against the stick.

A finger pulls on a rubber band, and the rubber band pushes against the finger.

Explanation:

As per Newton's III law every action has equal and opposite reaction.

This shows that action force on a system will give a reaction force on the other system which apply the action force on it.

So here we can say if hockey stick hits the puck then this is action force then the reaction force must be on hockey stick by the puck.

Similarly in other example if a finger pull on rubber band then this shows action force then rubber band will push the finger with same force so this is reaction force on finger.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.