- #1
Westin
- 87
- 0
Homework Statement
You are helping your friend move, using a ramp to move boxes from the ground to the moving truck. You give a 26kg box a shove so it moves at 1.4m[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmmi10/alpha/144/char3D.pngs at the bottom of the ramp. The angle that the ramp makes with the ground is 31[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmsy10/alpha/100/char0E.png. The coefficients of static and sliding friction are 0.39 and 0.1, respectively.
a) For how much time does the box slide up the ramp?
[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmr10/alpha/144/char01.pngt=
b) How far up the ramp does the box slide?
[PLAIN]https://s3.lite.msu.edu/adm/jsMath/fonts/cmr10/alpha/144/char01.pngx= c) When the box stops sliding up the ramp, does it remain stopped or begin sliding back down?
d) Explain how you determined your answer for part (c):
[/B]
Homework Equations
u = a/g
a = delta v / delta t
other friction equations
[/B]
The Attempt at a Solution
.39*9.8*26 = 99.372
.1*9.8 = 25.48
I believe you need to sin31 and set up an equation that compares the two frictional forces together to get an answer but I am having trouble setting it up.
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