//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.