College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Suppose your friend is sitting on a sled and asks you to move her across a flat, horizontal field. You have a choice of (a) pushing her from behind by applying a force downward on her shoulders at 30° below the horizontal (Fig. 4.22a) or (b) attaching a rope to the front of the sled and pulling with a force at 30° above the horizontal (Fig. 4.22b). Which option would be easier and why?

To determine
The direction of the force to push the friend in an easier way.


Pulling the rope from the front involves a component of force to be directed upwards. This counters the normal force and hence, the frictional force.


The vertical component of force directed upwards is Fsin30ο . The normal force between the sled and the snow is reduced by the vertical component

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