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Physics Oppos

Illustration for article titled Physics Oppos

I have a question for you. As I was driving to work this morning, I passed a big rig and it got me wondering how much effort it would take something like my GMC Envoy to move an empty semi trailer on a flat surface. That got me wondering about the physics of pulling something on wheels as opposed to pulling something without wheels.

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How does one determine the effort needed to pull something on wheels vs. something not on wheels?

If an empty semi trailer weighs 15,000lbs, on a flat surface it should feel like pulling less because the wheels mitigate some of the friction, right?

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