One question related to newton's third law, v t p u o u o It is a rope with a wheel,v. If 50N is applied from u pulling towards the ground, what's the reaction force? From o to p ? Two questions related to work, I think the force in the equation of work done is continuously applied,like weight, right? And the object would not stop finally, right? For the PE, a weight of 100N is lifted up by a man up to a height of 10m. Why the force applied by the man continuously is 100N? Isn't 100 N causing no effect on the weight as it is compensated by the mg of the weight, right?