Engineering Mechanics: Statics
8th Edition
ISBN: 9781118807330
Author: James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher: WILEY
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Textbook Question
Chapter 6.3, Problem 2P
The 50-kg block rests on the horizontal surface, and a force
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6/3 The force P is applied to the 50-kg block when it is at
rest. Determine the magnitude and direction of the
friction force exerted by the surface on the block if
(a) P = 0, (b) P = 200 N, and (c) P = 250 N. (d) What
value of P is required to initiate motion up the
incline? The coefficients of static and kinetic friction
between the block and the incline are , - € 0.25 and
= 0.20, respectively.
50 kg
U
Problem 6/2
15°
20°
H₂ = 0.25
k=0.20
Problem 6/3
The force P is applied to the 53-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the
surface on the block if (a) P = 0, (b) P=185 N, and (c) P=292 N. (d) What value of P is required to initiate motion up the incline? The
static and kinetic coefficients of friction between the block and the incline are ₁-0.24 and U-0.19, respectively. The friction force is
positive if up the incline, negative if down the incline.
Answers:
(a) F-
(c) F=
53 kg
14°
(d) P=
(b) F- i
i
i
23
P=0.24
P₁=0.19
N
N
N
N
Q1. The member OA rotates about a horizontal axis through O with a constant counter
clockwise velocity w=2 rad/s. As it passes the position 0 = 0°, a small block of mass m is
placed on it at a radial distance r = 400 mm.
(a) If the block is observed to slip at 0 = 50°, determine the coefficient of static friction
us between the block and the member.
(b) Before the block slips, calculate the value of 0 at which there is no frictional force
applied to the mass.
(c) At a later stage, the angular velocity is increased from 2 rad/s to 7 rad/s in 3
seconds. The angular acceleration is known to be a = k t, where t is time. Find k.
%3D
m
Figure Q1
Chapter 6 Solutions
Engineering Mechanics: Statics
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