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Chapter

Student Handout Lesson 6Exam


Department
Civil Engineering
Course Code
CE 2450
Professor
All

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Chapter(3(
Equilibrium(of(a(Particle(
(
3.1(Condition(for(the(Equilibrium(of(a(Particle(
A"particle"is"in"equilibrium"if"it"remains"at"rest"if"originally"at"rest,"or"has"a"constant"
velocity"if"originally"in"motion"
"
Static(Equilibrium"describes"an"object"at"rest"
"
Newton’s"first"law"of"motion"states"
F=ma
"
"
If"an"object"is"in"equilibrium"
F=0
"
(
3.2(The(Free=Body(Diagram(
The"free(body(diagram"includes"the"chosen"subsystem"and"representations"for"all"the"
forces"acting"on"the"subsystem."
"
Common"forces"in"statics:"
Springs"–"the"force"applied"by"a"spring"to"an"object"attached"to"it"is"directly"
proportional"to"the"change"in"length"of"the"spring"from"an"unloaded"state.""The"
constant"of"proportionality"is"called"a"spring"constant"or"stiffness"and"is"represented"
by"k."
F=ks
"
"
"
Cables"and"pulleys"
In"our"studies,"cables"are"assumed"to"have"negligible"weight"and"do"not"
stretch."
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