A Ciência do FUTEBOL

Physics and Physiology in Soccer

The video explains how physics and physiology shape soccer, from players’ physical traits to ball movement, goalkeeping, and body temperature.

Players’ Physiques and Energy Use

Soccer players vary in build, but defenders may benefit from greater height and strength when challenging attackers.

Soccer involves repeated short bursts of speed, unlike the sustained effort of a marathon. These bursts require rapid energy production and are associated with fast, “white” muscle fibers. The subtitles contrast this with energy production that relies continuously on oxygen. This should not be taken to mean that players literally do not breathe or that aerobic energy is never used.

Force and Dribbling

Dribbling and accelerating involve force, described by the relationship:

Force = mass × acceleration

The video compares Ronaldo’s reported mass—75 kg in 1994 and 96 kg in 2006—and says that producing the same acceleration at the higher mass would require about 28% more force. It uses lighter players such as Neymar and Messi as examples of attackers who can more easily evade heavier opponents.

Free Kicks and Ball Flight

A free-kick taker must apply force to change the ball’s velocity and direction.

Air resistance slows the ball. The video explains that drag changes with speed, so the ball may lose horizontal speed more rapidly as it slows. This can make its path dip toward the goal, turning an apparently overhit shot into a goal.

Curving shots are attributed to the Magnus effect: a spinning ball changes the airflow around it, creating a sideways force that bends its trajectory.

Penalty Kicks and Goalkeeping

The video states that about 70% of penalties result in goals, focusing on the remaining 30% that are saved. It gives the goal dimensions as 7.32 m wide and 2.34 m high, and compares a goalkeeper’s movement time with the ball’s travel time.

Since a penalty can reach the goal in under half a second, the goalkeeper cannot wait to see where the ball is going. To make a save, they generally have to choose a direction and begin diving before the ball arrives.

Heat and Cooling During a Match

Running and other exertion produce heat. To keep body temperature near 37°C, players must transfer heat to the surroundings at a rate that balances its production.

Heat is transferred through radiation, conduction, and sweating. Sweat cools the body when water on the skin evaporates, carrying thermal energy into the environment.

Speakers and Sources

• Speaker: An unnamed narrator; no other speakers are identified in the subtitles.
• Source credited in the video metadata: Ciências Olímpicas, by Otaviano Helene.