3 . Scientists have classified all forces that exist as one of four fundamental forces. List these forces in order from the strongest to the weakest. 4. Suppose you are standing on a scale in a moving elevator and notice that the scale reading is less than your true weight. a) Draw a free-body diagram to represent forces acting on you. b) Describe the types of elevator's motion that would produce the effect (use terms: moving up or down, speeding up or slowing own). Justify your answer! 5 . You are having a debate with your lab partner about the correct solution to a physics problem. He says that the normal force acting on an object moving along a surface is always equal and opposite to the force of gravity. You disagree with this denition a) Provide the proper definition for the normal force acting on an object. b) Describe (sentence), with the aid of free-body diagrams, three situations in which the normal force acting on an object cannot be determined using your lab partner's denition. c) Describe (sentence), with the aid of free-body diagrams, a situation in which your lab partner's definition could apply. 6. Describe three examples in which different forces are contributing the centripetal force that is causing an object to follow a circular path. Name these forces. 7. A force F produces an acceleration a when applied to a certain body. If the mass of the body is decreased four times and the force is decreased nine times, what will be the effect on the acceleration of the body? Show steps. Give an exact