Ways to find force normal in relation to force of friction

Pippi86
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Please tell me some ways to find force normal in relation to force of friction.
 
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The Normal Force is the force perpendicular toa plane.
 
Friction is because normal force. If normal force is mg cos \alpha, then friction force is \mu mg cos\alpha.
 

Thread 'Inclined treadmills and Galilean Invariance'

This has been discussed many times on PF, and will likely come up again, so the video might come handy. Previous threads: https://www.physicsforums.com/threads/is-a-treadmill-incline-just-a-marketing-gimmick.937725/ https://www.physicsforums.com/threads/work-done-running-on-an-inclined-treadmill.927825/ https://www.physicsforums.com/threads/how-do-we-calculate-the-energy-we-used-to-do-something.1052162/
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