A sliding block rubs against the surface beneath it. Friction acts against the slide and slows it down. Stronger friction stops the same starting block sooner. A faster start needs more stopping distance. With the same friction, doubling starting speed makes the stopping distance four times as long in this model. Keep the starting speed the same and compare weaker and stronger friction. Then try a faster start.
Forces, motion and energy · Discover & try
What sets the stopping distance of a sliding object?
Reading level 2 of 5 · DevelopingChange
Word help
Kinetic friction
Friction between surfaces sliding relative to each other.
Coefficient
A model factor relating friction to the normal contact force.
Stopping distance
The distance travelled before the model reaches rest.
Watch · Try · Explain
See how it works
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Ideal constant kinetic friction on a level surface; coefficients are illustrative, not material measurements.
What to look for
- The block travels farther before stopping.
- The stronger opposing force stops it sooner.
- Doubling speed makes the stopping distance four times longer in this model.
Explain what you noticed
On a separate ideal slide, starting speed doubles while the friction coefficient stays fixed. What happens to stopping distance?
Keep this idea: In the selected sliding model, more friction stops motion sooner and greater starting speed increases stopping distance.
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