2. The three bars have a weight of WA = 20 lb, WB = 40 Ib, and Wc = 60 Ib respectively. If the coefficients of static friction at the surfaces of contact are as shown, determine the smallest horizontal force P needed to move block A. CHCB = 0.5 17 В HBA = 0.3 D 15 A HAD = 0.2 D

2. The three bars have a weight of WA = 20 lb, WB = 40 Ib, and Wc = 60 Ib respectively. If the coefficients of static friction at the surfaces of contact are as shown, determine the smallest horizontal force P needed to move block A. CHCB = 0.5 17 В HBA = 0.3 D 15 A HAD = 0.2 D

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.

Question

The three bars have a weight of WA = 20 lb, Wâ =
40 Ib, and Wc =
2.
60 Ib respectively. If the
coefficients of static friction at the surfaces of
contact are as shown, determine the smallest
horizontal force P needed to move block A.
C"CB = 0.5
17
BHBA = 0.3
15
A
HAD = 0.2
D

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