Which statement is true?

The statement that weight is always a force is true because weight is defined as the gravitational force exerted on an object due to its mass. It is calculated as the product of mass and the acceleration due to gravity (W = mg). This means that weight specifically measures the force with which an object is pulled towards the center of the Earth (or another body with mass) and is directed downward.

Understanding this relationship is fundamental in biomechanics since weight influences how forces act during movement, stability, and load-bearing activities. Other terms, like pressure, define different physical concepts relating to force per unit area, and torsion relates to twisting forces rather than weight or pressure. Hence, weight being classified solely as a force provides clarity essential for understanding biomechanical principles.