Assuming that the angle at which you push on the edge of the box is again 45∘, with what magnitude of force fp should you push if the box were to slide down the wall at a constant velocity? note that, in general, the magnitude of the friction force will change if you change the magnitude of the pushing force. thus, for this part, assume that the magnitude of the friction force is f=0.516fp.

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?

Which change would make the diagram correct?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force