In biomechanics, absorption describes which of the following?

• A. The turning or twisting force
• B. The energy lost due to friction
• C. The body's ability to reduce kinetic energy of an object by applying negative force, like catching a ball
• D. The vertical height of a projectile

Answer: (C)

Absorption in biomechanics refers to how the body takes in and dissipates energy when momentum is reduced during deceleration. When you catch a ball, for example, your hands, arms, and even the legs and core apply forces opposite to the ball’s motion. This negative work by muscles (often via eccentric contractions) slows the object down and decreases its kinetic energy, protecting joints by spreading out the impact and converting some energy to heat or storing it briefly in elastic tissues.

That’s why catching a ball is a clear illustration: the body actively absorbs the incoming energy to reduce the velocity and force of impact. The other options describe forces or aspects not about energy absorption: turning or twisting forces are torques, friction energy loss is a different form of energy dissipation at surfaces, and the vertical height of a projectile relates to motion, not how the body absorbs energy during deceleration.