The force exerted by the person is an upward force equal to the weight of the box, and that force is perpendicular to the motion. If there is no motion in the direction of the force, then no work is done by that force. It changes the direction of the motion, but it does no work on the object.

If a force is applied but the object doesn’t move, no work is done; if a force is applied and the object moves a distance d in a direction other than the direction of the force, less work is done than if the object moves a distance d in the direction of the applied force. …

Without forces and motion everything would not be able to move. A force must be applying against an object to set it in motion. If you push or pull it is applying a force. Applying a force on an object changes its motion.

Work is said to be done when force is applied on an object moves through a distance in the direction of application of force. It is same as the product of force and displacement. Work is basically a form of energy, so in general, when the work is done on an object it must result in a change of its energy.

No. This is because even though there is a net force acting on a wall, no work is done—since you’re unsuccessful in moving it. This is because the force does not cause any displacement.

An object at rest is being acted on by several forces which add up to zero. If we define work as force times distance, there’s no work being done on the box, because the box isn’t moving.

If the net work done on an object is zero, it follows that its change in kinetic energy is also zero. Therefore,its speed remains the same.

Can the speed of an object change if the net work done on it is zero? No, force would decrease, but distance would increase, which would keep work constant.