For this ideal level slide, friction is μmg and the deceleration magnitude is μg. The mass cancels, so two different masses with the same starting speed and coefficient stop after the same distance in this model. This result depends on the assumptions; it is not a universal rule for every vehicle or surface.
Forces, motion and energy · Discover & try
What sets the stopping distance of a sliding object?
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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
- Compare stopping distance when speed changes.
- Change mass while keeping the coefficient.
- Notice when kinetic friction ceases at rest.
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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