Physics 10-23-09 Friction & Normal Force
PHYSICS: Happy Friday! So why don’t things that are moving just keep moving? Here’s the lecture from today on friction. Remember a few key things. Net forces produce acceleration. You can find Ff a couple of different ways – it’ll be part of a net force equation and can be found from the coefficient of friction equation. If and ONLY if your object is moving at a constant velocity, Ff will equal Fa. Fn is only sometimes equal to Fw. If your object is pulled at any angle (or pushed), Fn will be a part of Fnet in the vertical direction. Is that enough for now? Have a great weekend!
October 26th, 2009 at 5:48 PM
I think that I understand these friction problems a lot better now that we’ve gone over incline problems.
Drawing pictures really does help!
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