Block on incline

  • Thread starter Ab17
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  • #1
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Homework Statement


3.00-kg block starts from rest at the top of a 30.0° incline and slides a distance of 2.00 m down the incline in 1.50 s. Find (a) the magnitude of the acceler- ation of the block, (b) the coefficient of kinetic friction between block and plane, (c) the friction force acting on the block, and (d) the speed of the block after it has slid 2.00 m.

Homework Equations




The Attempt at a Solution


a = 1.78 m.s2

(B) fk - [email protected] = ma
[email protected] - [email protected] = ma
[email protected] [email protected] = a
Uk= (a+ [email protected])/[email protected]
Uk = 0.787
 

Answers and Replies

  • #2
99
2
Not getting the correct answer where am I going wrong?
 
  • #3
gneill
Mentor
20,912
2,860
You have a sign issue with the directions of the vector components. Draw an FBD that shows the directions of the vectors involved. Include the acceleration vector so that your choice of coordinate system is clear (so that the signs you assign to the force vectors when you write your equations match your choice of + direction for the acceleration).
 
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Likes Ab17
  • #5
99
2
But i still get the same eqn
 
  • #6
cnh1995
Homework Helper
Gold Member
3,442
1,147
But i still get the same eqn
Signs should change in your equation.
 
  • #7
99
2
Ya I see it now. I made such a stupid mistake
 

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