Time remaining:
Coefficient of kineticnfriction

Physics
Tutor: None Selected Time limit: 1 Day

A box slides down a 38.4

ramp with an

acceleration of 1.33 m/s

2

.

The acceleration of gravity is 9.8 m/s

2

.

Determine the coefficient of kinetic friction

between the box and the ramp.

Dec 7th, 2014

Hope this helps 

ma = mg sinθ - μ mg cosθ 


Now you can factor out the mass. 

a = g sinθ - μ g cosθ 

See...I told you we wouldn't need the mass! We can also simplify the right side a bit... 

a = g(sinθ - μ cosθ) 

1.11 m/s² = (9.81 m/s²)(sin37º - μ cos37º) 

1.11 m/s² = (9.81 m/s²)(0.602 - μ(0.799)) 

0.113 = (0.602 - μ(0.799)) 

-0.489 = -μ(0.799) 

μ = 0.612 

I hope that helps. Good luck!

Dec 7th, 2014

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Dec 7th, 2014
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