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Senseiofj
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Homework Statement
A brick is on a 121 cm plank, and the plank is lifted gradually until the brick begins to slide, when the plank is lifted 48cm in the air at an angle of 30º. I need to find the Frictional Force, and µ kinetic.
How do I find these things knowing only these three things?
Homework Equations
Ff=(µk)(Fn) let Fn= Normal Force
F=ma
g=9.81 m/s/s
Fn=mg(Cosø)
The Attempt at a Solution
I tried using the first equation I mentioned, but was unable to figure how to get both values.
Help is much appreciated.