University Physics (14th Edition)
14th Edition
ISBN: 9780133969290
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 4.29E
A chair of mass 12.0 kg is sitting on the horizontal floor: the floor is not frictionless. You push on the chair with a force F = 40.0 N that is directed at an angle of 37.0° below the horizontal, and the chair slides along the floor. (a) Draw a clearly labeled free-body diagram for the chair. (b) Use your diagram and Newton’s laws to calculate the normal force that the floor exerts on the chair.
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A chair of mass 12.0 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 40.0 N that is directed at an angle of 37.0 below the horizontal, and the chair slides along the floor. (a) Draw a clearly labeled free-body diagram for the chair. (b) Use your diagram and Newton’s laws to calculate the normal force that the floor exerts on the chair.
A woman at an airport is towing her 15.0 kg suitcase at constant speed by pulling on a strap at an angle θ above the horizontal (see figure). She pulls on the strap with a 38.5 N force, and the friction force on the suitcase is 20.0 N.
A woman holds the strap of a suitcase while pulling it to the right. The strap makes an angle θ measured counterclockwise from the horizontal.
(a)
Draw a free-body diagram of the suitcase.
This answer has not been graded yet.
(b)
What angle does the strap make with the horizontal (in degrees)?
(c)
What is the magnitude of the normal force that the ground exerts on the suitcase (in N)?
A 55.0 kg box is initially at rest on the flat floor. The coefficients of friction between the floor and the box are μk = 0.230 and μs = 0.540. You push the box horizontally, as shown in the picture below. (a) Draw a free body diagram of the box. (b) How much force would you have to apply to get the box to start moving? Give your answer in Newtons. (c) If the force of your push is 395 N, what is the resulting acceleration of the box? Give your answer in m/s2.
Chapter 4 Solutions
University Physics (14th Edition)
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