Why does the principal of lateral continuity work?
2 answers:
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The expression for the frictional force between the sled and the ground is:
where
is the coefficient of friction, m is the mass of the object and 
is the gravitational acceleration.
The friction force in our problem is F=80.85 N. The mass of the object is m=15 kg. Re-arranging the formula, we can find the value of k:
where
The friction force in our problem is F=80.85 N. The mass of the object is m=15 kg. Re-arranging the formula, we can find the value of k: