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.
Forces, motion and energy · Discover & try
What sets the stopping distance of a sliding object?
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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.
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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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