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Why does friction slow things down?

Test how different surfaces resist motion.

ScienceClass 84 min video
Preview of the friction video showing a box sliding on a rough surface3:42

What you'll learn

  1. 1What friction is
  2. 2How friction opposes sliding motion
  3. 3When friction is useful and when it is not

What happens next

Watch short videoSee how friction slows a sliding box and turns motion into heat.Try interactive experimentInteractive activity coming soon.Quick check quizTest what you've learned.
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