Sports
Potential Energy in Sports
Quick fact
A 70 kg pole vaulter at the top of a 6 meter vault stores about 4,100 joules of gravitational potential energy—enough to lift a small car by a few centimeters.
Why this is interesting
Why can a diver tuck their body to spin faster, and a pole vaulter soar higher than their own running speed? The answer lies in a hidden energy bank called potential energy.
Read the full explanation
Understanding Potential Energy in Sports
Potential energy is energy that is stored and ready to be used. In sports, it comes in two main forms: gravitational and elastic. Gravitational potential energy depends on an object's height—the higher an athlete or object is, the more stored energy it has. For example, a diver on a platform has more potential energy than one swimming in the pool. Elastic potential energy is stored when something is stretched or compressed, like a drawn bowstring or a compressed springboard. When released, that stored energy converts into kinetic energy (motion). Athletes constantly manipulate their bodies and equipment to maximize or control this conversion, turning potential energy into speed, height, or rotation.
A deeper explanation
The mechanism behind potential energy in sports is rooted in the fundamental principles of work and energy. Gravitational potential energy (GPE = mgh) increases with mass (m), gravitational acceleration (g), and height (h). Athletes gain GPE by climbing steps, running up ramps, or lifting their center of mass during a jump. In events like the high jump or pole vault, the athlete converts horizontal kinetic energy into vertical potential energy, reaching a peak height before gravity pulls them back down. Elastic potential energy (EPE = 1/2 k x²) depends on the stiffness (k) of the material and the distance deformed (x). A pole vaulter's fiberglass pole bends, storing elastic energy that is released to propel the athlete upward. Similarly, a diver's arch on a springboard stores energy that launches them into a spin. The conservation of energy principle ensures that total mechanical energy (potential + kinetic) remains constant if non-conservative forces like air resistance are negligible. This means that as an athlete’s potential energy increases, their kinetic energy decreases, and vice versa. Understanding this interplay allows athletes to optimize their technique—like tucking to reduce moment of inertia, which lowers potential energy but increases rotational speed. Each sport exploits these transformations to achieve spectacular results.