Practice Passage Test - 8 | Practice Passages for MCAT PDF Download

Passage

The physics of walking and running encompasses the principles of motion, force, and energy transfer that are involved in these fundamental human activities. When we walk or run, our bodies undergo a series of coordinated movements that allow us to move efficiently and effectively.

Walking involves a cyclic motion known as the gait cycle. As we take a step forward, our bodies shift our center of mass over one leg while the other leg swings forward. This motion requires the generation of forces to propel us forward and maintain balance. One key concept in walking is the conservation of angular momentum. As our legs swing forward, our upper body rotates in the opposite direction to conserve angular momentum, preventing us from toppling over.

Running, on the other hand, involves a more complex series of movements. It is characterized by a period of double support when both feet are briefly in contact with the ground, followed by a period of flight when neither foot is touching the ground. This alternating pattern allows for increased speed and efficiency.

The physics behind walking and running can be explained using Newton's laws of motion. The force exerted by our muscles propels us forward, while the ground reaction force provides the necessary support. Additionally, the transfer of kinetic energy from one leg to the other allows for continuous forward motion.