Determine the horizontal force required to move a 2,539-lb automobile with 23-in.- diameter tires along a horizontal road at a constant speed. Neglect all forms of friction except rolling resistance, and assume the coefficient of rolling resistance to be 0.05 in. Given: • Weight of car = 2,539-lb • Tire diameter = 23-in • coefficient of rolling resistance b=0.05 in Find: the horizontal force required to move car = lb

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Wheel Friction and Rolling Resistan
(a) Effect of andefriction
• One source of resistance.
to wheel motion is axle
friction. Moment M due
to frictional resistance of
axle bearing is balanced
by couple produced from
equal and opposite forces
P and F.
Without friction at rim,
M= 0 and wheel would
slide.
(6) Free whool
A free wheel (i.e..
not connected to an
axle) rolling over a
rigid horizontal
surface at constant
speed is not subject
to friction. In reality..
the wheel will
eventually roll to a
stop because contact
surface does deform.
Given:
Determine the horizontal force required to move a 2,539-lb automobile with 23-in.-
diameter tires along a horizontal road at a constant speed. Neglect all forms of
friction except rolling resistance, and assume the coefficient of rolling resistance to
be 0.05 in.
• Weight of car = 2,539-lb
• Tire diameter = 23-in
• coefficient of rolling resistance b=0.05 in
Find:
the horizontal force required to move car =
(c) Rolling re
• Deformations of
and ground caus
resultant of grou
reaction to be ap
B. P is required
balance moment
about B.
Pr=Wb
b=horizontal
= coef. of rolli
resistance
lb
Transcribed Image Text:Wheel Friction and Rolling Resistan (a) Effect of andefriction • One source of resistance. to wheel motion is axle friction. Moment M due to frictional resistance of axle bearing is balanced by couple produced from equal and opposite forces P and F. Without friction at rim, M= 0 and wheel would slide. (6) Free whool A free wheel (i.e.. not connected to an axle) rolling over a rigid horizontal surface at constant speed is not subject to friction. In reality.. the wheel will eventually roll to a stop because contact surface does deform. Given: Determine the horizontal force required to move a 2,539-lb automobile with 23-in.- diameter tires along a horizontal road at a constant speed. Neglect all forms of friction except rolling resistance, and assume the coefficient of rolling resistance to be 0.05 in. • Weight of car = 2,539-lb • Tire diameter = 23-in • coefficient of rolling resistance b=0.05 in Find: the horizontal force required to move car = (c) Rolling re • Deformations of and ground caus resultant of grou reaction to be ap B. P is required balance moment about B. Pr=Wb b=horizontal = coef. of rolli resistance lb
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