Article
Illustrations by Graham Murdoch; simonkr/Getty Images (photo)

The Science of GOAL!

With 250 million players, soccer is the most popular sport in the world. Check out the science behind it!

By Maggie Mead
From the October/November 2024 Issue

Learning Objective: Students will ask and answer questions about the forces involved in soccer based on a video, an article, and their own observations.

Other Focus Areas: Geometry
kinetic energy

the energy of an object in motion

force

a push or a pull on an object

potential energy

stored energy due to an object’s position

Nice Kick!

In soccer, teams of 11 players compete to get the ball into their opponents’ net. Except for the goalie, who guards their team’s goal, players can’t use their hands. The main way players move the ball is by kicking it with their feet. They kick the ball differently if they’re running with the ball, passing it, or shooting it.

For most kicks, players strike the ball with the inside of their foot rather than with their toe. Using this larger surface gives players more control over the direction the ball moves. Players can also control how much energy they move to the ball. They can softly tap the ball or send it speeding off their foot to their teammate—or straight into the goal!

Illustrations by Graham Murdoch; simonkr/Getty Images (photo)

A soccer kick starts when a player brings their leg back at the hip. The leg and foot are full of potential energy.

The leg swings into the ball, striking it at up to 45 miles per hour! Kinetic energy transfers from the foot to the ball.

The force of the kick squeezes the ball together. Then it expands, giving it a boost of energy. The ball zooms off the foot at up to 60 miles per hour!

Use Your Head

Soccer players mainly move the ball with their feet. But when the ball is kicked high into the air, they often use a different body part to change its direction—their head. A shot or pass made with the head is called a header.

During a header, the ball can strike a player’s head with up to 300 pounds
(136 kilograms) of force! Hits to the head can cause the brain to bounce back and forth inside the skull, leading to serious injury. That’s why experts recommend players younger than 12 avoid headers completely.

For older players, it’s important to use proper form during a header. That means flexing their neck muscles and moving their head toward the ball. This causes their brain to bounce less inside their skull and helps prevent injury.

Illustrations by Graham Murdoch; NELSON ALMEIDA/AFP via Getty Images (#02 Danilo  during the Qatar 2022 World Cup quarter-final between Croatia and Brazil)

Brazil’s Danilo Luiz da Silva uses his legs to push down. The ground pushes back. He jumps up, positioning his head in the ball’s path.

Just as the ball strikes da Silva’s head, he pushes his head into the ball while twisting his neck.  

This small movement gives the ball energy and pushes it in a new direction.

Bend the Ball!

Jaedyn Shaw, a pro soccer player on the San Diego Wave, stands at the corner of the field. The ball sits on the ground before her. With a swift kick, she sends the ball soaring forward. At first, it moves through the air in a straight line. But then it does something strange. The ball starts to curve. It zooms past the goalie and into the net!

Players often use this impressive shot during a corner kick after a ball has gone out of bounds. By causing the ball to turn in the air, a player can have a chance of getting it close to the goal even when the angle looks impossible. It may seem like a magic trick, but it’s not! Read the steps above to learn how it works.

Illustrations by Graham Murdoch; Brad Smith/ISI Photos/USSF/Getty Images  (#8 Jaedyn Shaw during the 2024 Concacaf W Gold Cup Group A match between USA and the Dominican Republic)

Jaedyn Shaw kicks the ball toward the goal, using her toe to strike it just to the right of its center.

Kicking the ball on its side causes it to spin in the air.

The spinning ball pushes off the air on its right. The air pushes back, causing the ball to curve toward the goal!

video (1)
Games (1)
Slideshows (1)
Activities (13)
Quizzes (1)
Answer Key (1)
Step-by-Step Lesson Plan

1. PREPARE TO READ (15 minutes)
Connect STEM vocabulary to sports.

  • Make a class list of sports students like to play or watch. Share the Vocabulary Slideshow and discuss a few ways the terms could apply to those sports. (e.g., A swinging bat applies force or pushes on a baseball, which transfers kinetic energy from the bat to the ball.)
  • Ask students to predict the most popular sport in the world. Discuss their responses, encouraging them to explain their reasoning. Reveal the correct answer by sharing the video “Notice and Wonder: Playing Soccer.” Have students turn and talk to a partner, sharing what they noticed about how the players moved. Then ask students to share with the class. Encourage them to use the vocabulary words from the slideshow to describe what they noticed.

2. READ AND Analyze (15 minutes)
Read the article and interpret its text features.

  • Give students a minute to preview the article, focusing on the text features and the order in which they are meant to be read. (The opening spread has a headline and a subheading. Each photo has a box with a caption, plus three numbered labels following the action. For each photo, the caption should be read first, then the numbered labels in order.)
  • Read the article aloud as students follow along, stopping to discuss important ideas and answer questions. If desired, use a sneaker and a soccer ball as props to show the two kicks described.
  • Have student pairs work together to cement their knowledge with the Quick Quiz. Discuss their answers as a class.

3. RESPOND TO READING (45 minutes)
Carry out a “feet-on” investigation to observe how a soccer ball moves.

  • Preview the Test Soccer Moves activity in advance and determine where students can do the moves safely, like a school gymnasium. Before students begin the activity, review your behavioral expectations with students and demonstrate moves as needed. (If you or another adult at school play soccer, you can arrange a demonstration of the techniques for further enrichment.) After trying out the moves, discuss students’ observations, encouraging them to use the article’s vocabulary to describe what they notice about how the player and the ball moved.

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