What physical quantity is called mechanical work?

Mechanical work A is called a physical quantity, which is determined by the formula: A = F * S * cosα.
Where F is the force that performs the work, S is the movement of the body under the action of the force, ∠α is the angle between the direction of action of the force F and the movement of the body S.
When the force F and the movement of the body S have the same direction, then ∠α = 0. Then the mechanical work is determined by the formula: A = F * S.
When the force F and the movement of the body S are directed perpendicular to each other, then ∠α = 90, cos90 = 0. Then the mechanical work is zero: A = 0.