suppose a box is sliding along the floor,and friction is resisting its motion with a force of 160n.how much force do you need to exert to keep the box moving at a constant velocity?
Since the bax must move at a constant velocity, the horizontal net force has to be zero, therefore, we need to apply the force =160 N.
To find out how much force is needed to keep the box moving at a constant velocity, we need to consider the principle of equilibrium where the force exerted by us should exactly balance the force of friction acting against the motion.
In this case, the force of friction resisting the motion is given as 160 N. To counteract this force, we need to exert an equal and opposite force in the direction of motion. Therefore, the force we need to exert to keep the box moving at a constant velocity is also 160 N.
It is important to note that we do not need to exert a force greater than the force of friction to keep the box moving at a constant velocity. If we were to exert a force greater than the force of friction, the box would accelerate, and if we exerted a force less than the force of friction, the box would decelerate.