Physics · Challenge

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Stopping distance energyRunning
Friction sled. Gravel bed length at 14.7 m. Work absorbed 36800 J, Kinetic energy 18750 J. Currently work absorbed is over by 18050 J.TUNINGLOADNORMAL FORCEWORK ABSORBEDKINETIC ENERGY14.7 M
t = 0.0s

Work absorbed

36800J

Kinetic energy

18750J

14.7 m

Friction sled. Gravel bed length at 14.7 m. Work absorbed 36800 J, Kinetic energy 18750 J. Currently work absorbed is over by 18050 J.

What has to balanceEk=f×dE_k = f \times d

What is happening

You take control of a runaway trolley ramp at the end of a steep service road.

The trolley will overrun the bed. It arrives carrying 18 750 J, the gravel resists with 2 500 N, and the bed as built is the wrong length.