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📘 A small patch carries every road force

A tire grips the road through its contact patch: the footprint where rubber presses against pavement.

4
lessons
~20 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Contact and rubberExplain the contact patch, normal load, and viscoelastic rubber deformation.Road forces pass through a changing footprint where load and rubber texture interact.
  2. Acceleration and brakingConnect torque, braking slip, and peak force before a full skid.Longitudinal force builds through controlled slip; ABS keeps tires near productive range.
  3. Cornering and wet roadsDescribe slip angle, tread channels, and hydroplaning risk.Lateral force comes from sideways deformation; grooves and speed manage wet contact.
  4. Pressure and grip limitsRelate inflation, the friction circle, and changing tire-road grip.Pressure shapes the footprint; braking, turning, and acceleration share one finite limit.

Questions this course answers

Where are the vehicle's road forces transmitted?

The changing rubber footprint is where tire forces reach the pavement.

Why does tread conform to pavement texture?

Viscoelastic rubber deforms around texture and helps create friction.

What usually happens before a tire becomes a full skid?

Useful force often peaks before sustained sliding begins.

What is slip angle?

Sideways tire deformation from this small angle creates lateral force.

What is a main job of tread grooves?

Grooves help evacuate water and preserve rubber-pavement contact.

Where should normal cold tire pressure be found?

The vehicle maker specifies the pressure for its load and handling design.

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