Finding Net Force with the Coefficient of Friction

  • Thread starter triamanda
  • Start date
  • #1
5
0

Homework Statement


A 51kg child goes down a 42 degree slide. What is the normal force on him? If the coefficient of friction is .10, what is the net force on him? How far down does he slide before reaching 2.5 m/s?


Homework Equations



Fk = μFn
F = ma

The Attempt at a Solution



Fn = 51gcos(42)
= 379 N

I have no idea what to do to find the net force.
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31
the component of the child's weights acts down the plane. Friction acts up the plane.

Also for a normal force N, the frictional force is given by μN.

Can you find the resultant force now?
 
  • #3
5
0
I believe so:
.10(379) = 38 N

Thanks!
 

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