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Oct. 27, 2017, 6:37 p.m.

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//Talking about normal force and sleds Schafer: So my kids will be like, 'Dad! Can you push our sled?' And I'll be like 'No.' And before you say that I'm a terrible parent, hear me out. I told them, 'I will not push your sled because if I push, the force vector will not only have a horizontal component but also a vertical one downwards which would lead to increased friction cue to more normal force and thus you would go slower. But I will pull your sled, because that vector points up.' Student 1: And the sled would hit your shins. Schafer: Well actually, I tie this big long rope around my waist and I walk. And then the kids fall off, and I just keep walking.