91Ó°ÊÓ

If a body travels a predetermined distance in the direction of a force, that force is said to have performed work.

There is a potential that there will be work if there is a force. I'm stating that there will be exceptions and that a force does not always result in work because it must cause the body to move in some way when it is applied.

Thus,

(a) There should be an active force (irrespective of the direction it acts)

(b) The body must be displaced as a result of the force.

A force operating on a body is defined as the product of the body's mass and its acceleration in the force's direction.

When there are unbalanced forces acting on an object, Newton's second law of motion applies. According to the second law, the mass of the item and the net force acting on it both affect how quickly an object accelerates. An object's acceleration is directly proportional to the net force applied on it and inversely proportional to its mass. An object's acceleration increases as the amount of force exerted on it does. A decreasing acceleration is caused by a rise in an object's mass.

Someone holding a door open for a extended period of time. They’re exerting a force by keeping the door open, but since the door is staying still, there is no motion. So, the work should be zero.

A force is needed to hold a barbell overhead, but this force does no work on the barbell while the barbell is at rest.