A basketball player plants one foot and cuts toward the basket.
A receiver reaches for a football while a defender closes in.
A trail runner climbs across loose dirt.
A cyclist squeezes the brakes heading into a turn.
All four athletes depend on the same scientific phenomenon.
Friction.
Students often first encounter friction as the force that “slows things down.” Push a book across a table and eventually it stops. Slide across the floor in socks and friction works against your motion.
That explanation is correct—but incomplete.
In sports, friction can be exactly what makes motion possible.
Shoes need grip against the ground so athletes can push, stop, cut, and change direction. Football gloves need enough surface interaction to help control a ball. Bicycle tires need traction against the road. Brakes deliberately create friction to reduce motion. Equipment designers spend enormous amounts of time deciding where they want more friction, where they want less, and how long a material can maintain its performance before it wears down.
That turns friction into something much more interesting than a vocabulary word.
It becomes an engineering problem.
Sports are especially powerful for teaching concepts like this because students can experience the science physically. The STEM Sports ebook describes active learning through sports as a way to place STEM concepts inside real-world situations rather than leaving them on a worksheet. The same ebook uses riding a bicycle as an example: students can feel momentum, pedaling force, and the friction of the brakes rather than encountering those ideas only in a textbook.
Friction is already part of the game. The classroom opportunity is helping students discover why.
There is even an entire branch of science and engineering devoted to questions like these.
It is called tribology.
The National Institute of Standards and Technology describes tribology as the interdisciplinary study of friction, wear, and lubrication, bringing together materials science, chemistry, physics, and mechanics.
That may sound like an advanced topic, but students experience tribology every day.
Their shoes grip the floor.
Pencil erasers rub against paper.
Bicycle chains need lubrication.
Tires slowly lose tread.
A ball reacts differently on hardwood than it does on grass.
Every example involves surfaces interacting.
For K–8 educators, the key is not asking students to memorize “tribology.” It is helping them think like tribologists by asking three simple questions:
What materials are touching?
What happens when they move against each other?
How could changing one material or surface change the result?
Engineers rarely ask, “How can we maximize friction everywhere?”
Instead, they ask how much friction is appropriate for a particular job.
A basketball shoe needs traction against a court, but other components must still flex naturally. A bicycle needs friction between the tire and road, while bearings are designed to reduce unwanted resistance. A trail shoe needs grip, but designers also care about durability because aggressive surfaces can wear.
That balance is visible in current footwear development.
Nike introduced its ACG Picklejus trail shoe on August 27, 2026, featuring a new GOATEK outsole designed for surfaces ranging from wet rock to loose dirt. Nike says its testing showed a 45% increase in wet traction and 25% greater abrasion resistance compared with its previous all-terrain outsoles. The company reports that the traction system went through five rounds of long-term wear testing and more than 18,000 athlete test miles.
This week, coverage of Salomon’s Genesis 2 highlighted the same design challenge from another angle: its revised outsole uses new lug geometry intended to improve traction on wet and muddy trails.
For students, these examples reveal an important engineering lesson.
Traction depends on more than one variable.
Material matters.
Shape matters.
Surface matters.
Wear matters.
Testing matters.
That makes traction an ideal STEM investigation.
Recommended grades: K–8
STEM focus: forces, measurement, variables, data collection
Create a simple tabletop ramp and cover sections with different materials such as smooth cardboard, felt, craft foam, textured shelf liner, or another classroom-safe surface.
Place the same block or object on each surface and gradually increase the ramp angle until the object begins to slide.
Students can compare which surfaces require the steepest angle before movement begins.
For younger students, the lesson may simply focus on observation and comparison: Which surface let the object slide first? Which held it longest?
Grades 3–5 can measure the ramp angle or height and record repeated trials.
Middle school students can calculate averages, graph results, identify possible sources of experimental variation, and discuss why repeated measurements matter.
NASA uses friction as a grades 5–8 forces-and-motion topic as well, distinguishing static, kinetic, and fluid friction and pairing the concept with a standards-aligned classroom investigation.
The sports extension is easy: ask students which ramp material they would choose if it represented the bottom of a sports shoe—and whether the same answer would make sense for every sport.
Before an object begins sliding across another surface, static friction helps resist that motion.
That is especially important in sports.
Imagine a basketball player pushing sideways to change direction. The shoe must interact with the court strongly enough for the athlete to push against the surface instead of simply sliding across it.
This is where shoe design becomes an engineering challenge.
STEM Sports already introduces footwear design through curriculum. The K–2 Multi-Sport curriculum includes a “Design a Shoe” module in which students use the Engineering Design Process to investigate basketball shoes. STEM Basketball for grades 3–8 takes the idea further with a full “Advancements in Shoe Technology” module.
A friction investigation gives educators a natural extension:
What should the bottom of that shoe look like?
Recommended grades: 2–8
STEM focus: engineering design, geometry, testing, optimization
Give student groups identical small blocks to represent shoes.
Using craft foam, cardboard strips, rubber bands, textured paper, or similar classroom materials, teams design different “outsoles” for the bottom of each block.
They might experiment with:
Then use the same tabletop ramp to test each design against several safe, dry surfaces.
Students should keep the block, mass, ramp, and testing method as consistent as possible so the tread pattern is the primary changing variable.
Ask teams to record not only which design performed best, but where it performed best.
A design that works well on smooth cardboard may behave differently on carpet or textured material.
That creates an authentic engineering realization:
There may be no single “best” tread.
The best design depends on the problem you are trying to solve.
Keep these models as tabletop prototypes; student-built soles should not be attached to shoes or used for running or slip testing.
Basketball gives students another familiar friction mystery.
Why do shoes squeak on a court?
A 2026 Nature report highlighted experiments using high-speed optical imaging to study exactly that question. Researchers found that familiar sneaker squeaks can result from wave-like deformations traveling across the soft shoe–hard floor interface. Those waves moved across the contact area at speeds approaching 300 kilometers per hour, while properties such as sole stiffness and thickness influenced the frequency of the sound.
That creates a useful science-literacy lesson.
A loud squeak does not automatically mean “better grip.”
Sound is evidence that something is happening at the shoe-floor interface, but students still need measurements before concluding how much traction exists.
That distinction—between what we notice and what the data actually shows—is one of the most important habits students can build through scientific inquiry.
It also connects nicely with STEM Sports’ recent sports acoustics content without repeating it: the acoustics article explores how sound waves behave, while a friction lesson asks what surface interaction helped produce that sound in the first place.
Friction does not only happen under an athlete’s feet.
It happens between hands and equipment, too.
STEM Football already provides an ideal connection. The curriculum explores the effectiveness of receiver gloves, includes receiver gloves in the physical kit, and asks students to graph pass-completion data related to glove use.
That makes football an excellent way to introduce material properties.
Recommended grades: 3–8
STEM focus: materials science, experimental design, measurement
Instead of testing gloves on students, create a tabletop model.
Cover identical blocks with different materials such as fabric, craft foam, textured rubber, smooth plastic, or felt. Place each block against the same inclined or vertical test surface and compare when sliding begins.
Students can investigate:
Which materials produce more resistance?
Does texture matter?
Does repeating the test change the result?
How would an engineer decide which material to explore further?
Older students can also consider durability.
A very grippy material may perform well in the first test, but what if its texture quickly wears away?
Now students are thinking beyond friction and into tribology.
A surface does not remain new forever.
Shoe tread rounds off.
Tires lose texture.
Grips smooth out.
Repeated rubbing can change the very surface engineers designed to create friction.
That is why the Nike example is so useful. Its recent GOATEK testing did not only measure traction; Nike also reported abrasion-resistance testing and long-term athlete wear trials.
Students can model the same principle on a smaller scale.
Give groups identical pieces of textured material and have them complete the same number of controlled rubbing cycles against a second surface. Compare the materials before and after with a hand lens or photographs.
Do not ask, “Which is strongest?”
Ask something better:
What changed, and how might that change affect performance?
That small shift helps students move from ranking materials to analyzing systems.
This topic works particularly well for curriculum and instruction teams because one investigation can cover multiple learning areas.
Students can study forces and motion through physical science.
They can compare materials through observation.
They can measure angles, distances, or repeated trials.
They can graph results and calculate averages.
They can use the Engineering Design Process to redesign tread patterns.
They can investigate wear and material durability.
And they can communicate recommendations using evidence.
The STEM Sports ebook specifically recommends project-based learning that makes STEM relevant through real-life applications, including activities involving mini-golf and friction, sports-ball experiments, and engineering models. It also encourages educators to connect lessons to sporting events students are already discussing because those real-world moments can become an entry point for learning.
Friction offers an especially accessible version of that approach because almost every piece of sports equipment gives students a surface to investigate.
STEM Sports educator case studies reinforce the value of turning abstract science into something students can experience.
Lisa Longino reports that students in East Cleveland became more engaged when they could investigate ideas such as velocity and changing heart rate through sports. She also describes students carrying what they learned in PE into later math and science discussions, helping the learning become cross-curricular.
Sandra Hayes sees the same enthusiasm in her middle school STEM classroom. Her students become so involved in STEM Sports lessons that they protest when the class timer signals the end of the period, and some have extended that interest into robotics programs.
Amy Rosengren puts the reason clearly into practice: science concepts such as energy and motion can be difficult when students cannot connect them to real life, while sports give those concepts immediate context. Her students’ favorite basketball investigation connects temperature with changes in ball behavior because it relates directly to the Arizona environment they know.
Friction can create the same kind of “Aha!” moment.
Students already know what grip feels like.
Now they can learn how to investigate it.
Several STEM Sports curricula provide natural launch points.
STEM Basketball includes shoe-technology lessons for grades 3–8, making it the strongest direct connection for outsole materials, tread design, and traction.
STEM Football explores receiver gloves and pass-completion data, giving students a hands-on connection between material design, grip, technology, and performance.
STEM Multi-Sport K–2 introduces the Engineering Design Process by having younger students design basketball shoes, allowing friction and texture to be introduced through age-appropriate observation.
STEM Bike gives grades 3–8 another systems-level connection through energy, velocity, gears, balance, and bike technology. The STEM Sports ebook’s bicycle example is especially useful here because students can connect friction to something they can physically experience, including the operation of brakes.
Together, these curricula can help students see that friction is not confined to one sport or one lesson.
It is everywhere surfaces meet.
Friction also introduces students to STEM careers that rarely appear on a scoreboard.
They might become:
Materials scientists.
Mechanical engineers.
Footwear engineers.
Product-testing engineers.
Tribologists.
Industrial designers.
Sports-surface engineers.
Quality engineers.
Research technicians.
Product developers.
The STEM Sports ebook emphasizes that becoming a professional athlete is not the only pathway for students who are passionate about sports; there are many STEM-related careers connected to the industry. Sandra Hayes makes the same connection with her students, reminding them that athletes depend on people who build, operate, maintain, measure, and improve the systems surrounding the game.
The next great sports innovation may not come from the athlete wearing the shoe.
It may come from the student designing the sole.
Friction is easy to overlook because it happens at the boundary between things.
A shoe and a court.
A glove and a football.
A tire and a road.
A brake pad and a wheel.
But that boundary is where some of the most interesting STEM in sports happens.
When students test surfaces, measure sliding, redesign tread patterns, compare materials, and study wear, they are not simply learning that friction slows objects down.
They are learning how scientists investigate forces.
How engineers work within trade-offs.
How designers use materials intentionally.
How data turns an observation into evidence.
And how a concept from physics can become a product, a career, and a solution to a real-world problem.
With STEM Sports®, even the science beneath a student’s shoes can become a reason to move, measure, question, and design.
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