What is the formula for work used in calculating work capacity?

• A. Force x Distance
• B. Mass x Acceleration
• C. Power x Time
• D. Distance x Time

Answer: (A)

Work is the amount of energy transferred when a force moves an object. When the force acts along the direction of motion and remains constant, the work done is the product of the force and the distance moved: W = F × d. This is the quantity used to quantify work capacity, representing how much mechanical work you’ve produced during a movement or workout.

If the force changes or isn’t aligned with the movement, you’d use the more general form W = ∫ F · ds, which accounts for the varying force along the path and reduces to F × d when the force is constant in magnitude and direction.

Mass × acceleration gives the force (F = ma), not work. Power × time would yield work only if power is known over that interval, but it isn’t the fundamental definition of work. Distance × time would describe speed times time, not the energy transferred.