- #1
Potatochip911
- 318
- 3
Homework Statement
What is the tension in the strap which the boy uses to hold onto the pack?
Mass of Boy=45kg
Mass of Pack=25kg
θ=42°
Coefficient of kinetic friction between boy and incline=0.35
Coefficient of kinetic friction between pack and incline=0.48
Acceleration of boy=4m/s^2
Homework Equations
Fnet=F1+F2+F3...+Fn
F=ma
The Attempt at a Solution
Mass of boy=M
Mass of pack=m
Fpb=parallel force of boy
etc...
Fpb=Mgsinθ
Fpp=mgsinθ
fsb=0.35Mcosθ
fsp=0.48mcosθ
a(M+m)=Fpb+Fpp-fsb-fsp-T
I'm really confused as to how to solve this since both acceleration and tension are unknowns. I've tried doing a lot of things to try and get a value for acceleration but none of them have given me the correct answer which is T=15N.