Can Friction Actually Push a Car Forward?

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Can friction make a car move forward? You've learned that friction opposes motion… right? Look at this driving tyre — it rotates as the car moves forward, touching the road without sliding, and tends to push the road backward at the contact point. The road exerts a static friction force forward on the tyre — the tyre pushes the road backward, and the road pushes the tyre forward. That's why we cross out 'Friction always opposes motion' and replace it with 'Friction opposes relative slipping,' as the tyre rolls without slipping. So remember: friction does not always oppose an object's motion. It opposes relative slipping, or the tendency to slip. Now think: what direction is friction on a walking person's foot?

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