A block sliding up a ramp, solve for acceleration

  • Thread starter acid234
  • Start date
  • #1
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Homework Statement


A block is sent sliding up a 50 degree ramp at an initial speed of 9m/s. The coefficient of kinetic friction between the ramp and the block is 0.51. Find the acceleration of the block.


Homework Equations


Fk = (Fn)uk
F=ma


The Attempt at a Solution


umgsin50 = ma
ugsin50 = a
0.51(-9.8)sin50 = a
a = -3.829

Which is far from the right answer.
 

Answers and Replies

  • #2
106
2
gravity! Think about if the block wasn't initially moving, would you know how to calculate its downward acceleration from gravity alone? The friction portion seems to be correct though.
 
  • #3
rl.bhat
Homework Helper
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Hi acid234, welcome to PF.
On the inclined plane, the retardation is caused by two factors. 1) Component of the weight along the inclined plane and 2) the frictional force. Find them
 

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