<span>The reaction force would be the exact opposite of the action. In this case, choice (c) would be the most correct. If the action is the ball pushing the glove, the reaction would then be the glove pushing back on the ball.</span>
The output work circumstances would be the fact that the machine could do a good amount of time at a good pace, and distance. where the machine doesn't need any help to be controlled. the input work would be you being able to use the machine with no difficulty. you are the client the machine is your server, you command, and the machine obeys.
We don't know WHY there are gravitational forces that attract everything
to everything else.
We DO know that the more mass is involved, the stronger the forces are,
and we know that if an object had no mass then it wouldn't be affected by
gravity. So you could say that it's MASS that gives an object gravity, and
the more mass the object has, the more gravity it has.