What is meant by positive work, negative work, and zero work?

What is meant by positive work, negative work, and zero work? Illustrate your answer with an example?

• POSITIVE WORK: Whenever force & displacement will be in the same direction, then things performed on an item are considered to be positive work. The work done on an item is considered to just be positive work whenever the force & displacement will be in the same direction.

Example: When an item travels horizontally, force and displacement both act in the same direction. As a result, the work completed is favourable.

Whenever a body falls beneath gravity’s influence, θ = 0o The outcome of the work is reported to be positive.

• NEGATIVE WORK: Whenever force & displacement are all in opposing directions, the work is said to have been negative work. Negative work is done when the displacement is now in the opposite direction of the force.

Example: Whenever an item is hurled upwards, gravity acts in such a downward direction, while displacement acts in an upward path.

When the brake pedal is pressed on a moving vehicle, the braking force creates a negative amount of work.

• ZERO WORK: Whenever force & displacement are both perpendicular to one another and if either force and displacement are zero, the work being done is said to have been zero. Whenever force and displacement stand perpendicular to one another or when neither force nor displacement exists.

Example: Whenever we move with a thing in our hands, the force operates in a downward direction, while displacement works in a forward direction.

When a coolie moves on some kind of horizontal platform while carrying a weight on his head, the labour done is equal to 90 degrees.