Lecture Notes for Sections 3.1-3.3
1
EQUILIBRIUM OF A PARTICLE IN 2-D
Today’s Objectives
:
Students will be able to :
a) Draw a free body diagram (FBD), and,
b) Apply equations of equilibrium to solve
a 2-D problem.
In-Class Activities
:
•
Reading quiz
•
Applications
•
What, why and how of a
FBD
•
Equations of equilibrium
•
Analysis of spring and
pulleys
•
Concept quiz
•
Group problem solving
•
Attention quiz
READING QUIZ
1) When a particle is in equilibrium, the
sum of forces acting
on it equals ___ .
(Choose the most appropriate answer)
A) a constant
B) a positive number
C) zero
D) a
negative number
E) an integer.
2) For a frictionless pulley and cable, tensions in the cable
(T
1
and T
2
) are related as _____ .
A) T
1
> T
2
B) T
1
= T
2
C) T
1
< T
2
D) T
1
= T
2
sin
θ

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