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AP Physics is Killer?
Ok. So I'm just totally lost here. I have normal force as 1.97N according to my calculations; however, I'm confused as to how I calculate the frictional force; and therefore the coefficient of friction. I have frictional force equaling 2.0678 / sin17.92, which would make the coefficient wrong as heck and way too big. Anyways, could anyone shed some light here?
You decide to find the coefficient of static friction between a paper cup and an archaic paper textbook. Armed with a metric ruler, you place the cup on the edge of the book, and raise the edge of the book until the cup starts to slide downwards. The length of the book is 26.0 cm, and you need to raise one edge 8.00 cm before the paper cup starts sliding. If the cup has a mass of 211 grams, what is the coefficient of static friction between the cup and the book?
1 Answer
- MadhukarLv 71 decade agoFavorite Answer
Coefficient of static friction
μ = tanθ,
where θ = angle with the horizontal of the book where the cup started to slide down.
=> μ = tanθ = 8 / √[(26)^2 - (8)^2] = 0.32.
[Mass is immaterial in this formula. μ does not depend upon mass.]
