Use the worked example above to help you solve this problem. An Eskimo returning from a successful fishing trip pulls a sled loaded with salmon. The total mass of the sled and salmon is 50.0 kg, and the Eskimo exerts a force on the sled by pulling on the rope. Suppose the coefficient of kinetic friction between the loaded sled and snow is 0.200. (a) The Eskimo pulls the sled 4.00 m, exerting a force of 1.25 x 10 N at an angle of 0 = 0°. Find the work done on the sled by friction, and the net work. We %3D fric W net %3D

Glencoe Physics: Principles and Problems, Student Edition
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Chapter5: Displacement And Force In Two Dimensions
Section: Chapter Questions
Problem 104A
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Use the worked example above to help you solve this problem. An Eskimo returning from a successful
fishing trip pulls a sled loaded with salmon. The total mass of the sled and salmon is 50.0 kg, and the
Eskimo exerts a force on the sled by pulling on the rope. Suppose the coefficient of kinetic friction
between the loaded sled and snow is 0.200.
(a) The Eskimo pulls the sled 4.00 m, exerting a force of 1.25 x 10 N at an angle of 0 = 0°. Find
%3D
the work done on the sled by friction, and the net work.
W.
fric
W.
%3D
net
(b) Repeat the calculation if the applied force is exerted at an angle of 0 = 30.0° with the
%3D
horizontal.
W.
fric
%3D
W.
%3D
net
EXERCISE
HINTS: GETTING STARTED I
I'M STUCK!
(a) The Eskimo pushes the same 50.0-kg sled over level ground with a force of 2.50 x 102 N exerted
horizontally, moving it a distance of 7.40 m over new terrain. If the net work done on the sled is
3.00 x 10J find the coefficient of kinetic friction.
(b) Repeat the exercise with the same data, finding the coefficient of kinetic friction, but assume the
applied force is upwards at a 40.0° angle with the horizontal.
Transcribed Image Text:Use the worked example above to help you solve this problem. An Eskimo returning from a successful fishing trip pulls a sled loaded with salmon. The total mass of the sled and salmon is 50.0 kg, and the Eskimo exerts a force on the sled by pulling on the rope. Suppose the coefficient of kinetic friction between the loaded sled and snow is 0.200. (a) The Eskimo pulls the sled 4.00 m, exerting a force of 1.25 x 10 N at an angle of 0 = 0°. Find %3D the work done on the sled by friction, and the net work. W. fric W. %3D net (b) Repeat the calculation if the applied force is exerted at an angle of 0 = 30.0° with the %3D horizontal. W. fric %3D W. %3D net EXERCISE HINTS: GETTING STARTED I I'M STUCK! (a) The Eskimo pushes the same 50.0-kg sled over level ground with a force of 2.50 x 102 N exerted horizontally, moving it a distance of 7.40 m over new terrain. If the net work done on the sled is 3.00 x 10J find the coefficient of kinetic friction. (b) Repeat the exercise with the same data, finding the coefficient of kinetic friction, but assume the applied force is upwards at a 40.0° angle with the horizontal.
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