Rolling Race

About this simulation

Rolling Race releases four bodies of equal mass and radius from rest on a ramp. Students change the ramp angle and gravity and restart with Race again. Readouts show the finishing order, winner time, the hoop to sphere time ratio and the accelerations. The sim shows that rolling bodies split energy between moving and spinning, so the moment of inertia factor k sets the acceleration. The solid sphere always wins and the hoop always finishes last.

What students can explore

Predict the finishing order, then run the race and check Finishing order.
Increase Ramp angle and see which times change and which order stays.
Lower Gravity to 1.6 m/s² and compare the Winner time with Earth gravity.
Read the Accelerations readout for sphere and hoop and compare them.
Press Race again and watch the hoop trail the sphere every time.

Learning objectives

1Explain why shape affects acceleration down a ramp.
2Relate moment of inertia to how mass is spread from the axis.
3Predict the finishing order of rolling objects.
4Recognize that mass and radius cancel in the rolling acceleration.

Questions teachers ask

Is the Rolling Race simulation free?

Yes. It is free to use, has no sign-up and runs in any modern browser, including whiteboards, tablets and Chromebooks.

Why does the solid sphere win?

It has the smallest share of its mass far from the axis, so less energy goes into spinning and more into moving down the ramp. The hoop has all its mass at the rim and is slowest.

How do I use it?

Set the ramp angle and gravity, then press Race again. Read the finishing order and times. The race also restarts automatically a few seconds after the last finisher.

Would a heavier hoop beat a lighter sphere?

No. Mass cancels from the equations, so only the shape matters. A heavy hoop and a light hoop take the same time, and both lose to any sphere.

Embed this simulation

Drop it into your LMS, blog, or class site — free.

<iframe src="https://kiwibee.io/en/simulations/rolling-race-3d-simulation/embed" title="Rolling Race | KiwiBee" loading="lazy" allowfullscreen style="width:100%;height:min(70vh,620px);min-height:420px;border:0;border-radius:16px"></iframe>

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