College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Concept explainers

Newton’s Third Law of Motion
The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”
Question

A horse is harnessed to a sled having a mass of 236 kg, including
supplies. The horse must exert a force exceeding 1 240
N at an angle of 35.0° in order to get the sled moving. Treat
the sled as a point particle. (a) Calculate the normal force on
the sled when the magnitude of the applied force is 1 240 N.
(b) Find the coefficient of static friction between the sled and
the ground beneath it. (c) Find the static friction force when
the horse is exerting a force of 6.20 x 102 N on the sled at the
same angle.

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