Question 2 A simple problem of pradical importance that ilustrates the nature of fricion is the study of the initafion of motion of an object on a rough surface. For the purpose of this example, lefs look at what happens when a person pushes a crate of mass m on a rough floor as shown in Figure 2. Letting u, and u, with p.< pa, be the stafc and kinetic friction coeffcients between the crate and the ground, respe dtively, consider a case in which the force P() = Pat. For this case, determine the time at which the moton begins and the friction force as a function of time. Figure 2: Aperson pushing a crate of mass m over a rough surface with a time-dependent force P)

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter6: Applications Of Newton’s Laws Of Motion
Section6.4: Kinetic And Rolling Friction
Problem 6.4CE: Imagine trying to push a heavy sofa across the room. At first you have difficulty getting the sofa...
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Question 2
A simple problem of pradical importance that illstrates the nature of fricion is the study of the initiafion of motion of
an object on a rough surface. For the purpose of this example, lefs look at what happens when a person pushes a
crate of mass m on a rough floor as shown in Figure 2. Letting u, and u, with u. < pn, be the static and kinetic friction
coeffcients between the crate and the ground, respe ctively, consider a case in which the force P() = Pat. For this
case, determine the time at which the moton begins and the friction force as a function of time.
Figure 2: A person pushing a crate of mass m over a rough surface
with a time-dependent force PI)
Transcribed Image Text:Question 2 A simple problem of pradical importance that illstrates the nature of fricion is the study of the initiafion of motion of an object on a rough surface. For the purpose of this example, lefs look at what happens when a person pushes a crate of mass m on a rough floor as shown in Figure 2. Letting u, and u, with u. < pn, be the static and kinetic friction coeffcients between the crate and the ground, respe ctively, consider a case in which the force P() = Pat. For this case, determine the time at which the moton begins and the friction force as a function of time. Figure 2: A person pushing a crate of mass m over a rough surface with a time-dependent force PI)
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