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Ramp A has a smooth at surface.
Ramp B has a rough uneven surface.
On which ramp would a race car go faster?
When a car goes down a smooth surface like ramp A, it will travel more quickly because it has less surface friction.
Ramp B has a rough surface, which creates more friction when the car travels over it, making it go much slower than the car on ramp A.
Friction is what happens when two things rub against each other. Friction slows or stops moving things. A rolling ball eventually stops because friction between the ball and the ground brings it to a stop.
See Friction in Action!
Roll a ball from one end of a basketball court to the other. Pretty easy, right?
Now try to roll the basketball that same distance on grass or gravel. Friction makes that a lot harder to do!
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© Vicki Whiting February 2025
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