![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNhnbjo2HFnTmoCrsQUyXKkx8jRsPQ5NuUc-phmnv_1FIMbsSlwvP7nSsZIIe57DO8MCjd6YwqGjl1MEfD8yU7P_JRx9gnJ6R_o7NVT4ob-nZm0Srx3h7IVW3cJYdPAzsNMdfpH1DTpMc/s320/original-rolling-wheels.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgTejxnYNrSj7huraGx4oPksDyv2OMuiBekAmuaqMld1qJ5DCmGGlG_hyphenhyphenaUh1ra249KtVT3u_dBNlGukpcIaU3N8IEy2kGG595Ul5ekkS9O8bpiiL6Mm5tauPa1vfsrqimcbJLq1AP9r8/s320/rolling_wheels_4.jpg)
Ralph came to me asking to re-design a image he had for a text book that was going to be published in the following months. He told me he wanted a more visually clear image of the concept of how the rolling balls reach the bottom of the slop due to varied friction and uniform friction.
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