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HelloImAsh
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Homework Statement
Five dogs, each having a mass of 30kg, pull a 250kg sled horizontally across the snow (coefficient of kinetic friction = 0.14).
How much force must each dog exert in order to move the sled at a constant velocity?
Homework Equations
Force of kinetic friction = coefficient of kinetic friction*normal force
Rewritten, the equation above would be F{k}=μ*F{n}
Also, normal force = gravitational force = mass*gravity
The Attempt at a Solution
F{k}=μ*F{n}
=0.14*m*g
=0.14*400kg*9.8N/kg
=549N
Therefore each dog would have to pull with 549/5=110N of force in order for the sled to move at constant velocity.
The problem is, in my workbook it shows that the answer should be 78.4N. What am I doing wrong?
Thanks