(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 2.00 kg is released on a 53.1degree incline, 4.0 m from a long spring with force constant 120 N/m that is attached at the bottom of the incline. The coefficients of friction between the package and the incline are static friction constant = 0.40, and kinetic friction constant= 0.20. The mass of the spring is negligible.

a)what is the speed of the package just before it reaches the spring.

b)what is the maximum compression of the spring?

c)the package rebounds back up the incline. How close does it get to its initial position?

2. Relevant equations

3. The attempt at a solution

K1+U1+Wother = K2+U2

Wother= -fs

s is 4m, the distance it needs to get to the spring.

f= fk + fs

fk= 0.20n

fs=0.40n

how do i get n? (n=wcos53.1??)

in that case f= fs+fk= [0.20(2*9.8)(cos53.1)]+[0.40(2*9.8)(cos53.1)]=7.06

f= [-(K2+U2)-(K1+U1)]/s

f=[-(0+mgh)-(0.5mv^2 + 0)]/4 = 7.06

28.24=(-2*9.8*h)-(0.5*2*v^2)

to solve for v, we need h, is h simple sin53.1?

(*i made a diagram as well, but it isnt allowing me to post it...*)

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Energy Conservation and Friction

**Physics Forums | Science Articles, Homework Help, Discussion**