Statics 1
, Forces and equilibrium
Newton's Third Law :
The force by A the
exerted one
body on
B
other is
equal in
magnitude opposite
in direction to the force exerted by B on A
.
· When
drawing FBD replace External
,
3 Internal Forces :
↳
(Egravity
supports with reaction forces between subsystems
in
forces e .
g
:
engine car
other objects
downwards is
·
Going
+ Ve
· The sum of all rector components is O
Fres = [F j =
SUMMARY :
: O
· For 2D
analysis
-vertical equilibrium : EFv o =
-
Horizontal force equilibrium : [FH = 0
- Moment equilibrium : [Ma O =
, Moment Of A Force
EXAMPLES
· ( + 5) cW
· (-5) <W
· can choose
any point as
-a b
L
reference · Vertical
equilibrium
Fu = 0 [Ma = o
=> FGbox 1 + FGbox2 -
FA = 0 aFabox1 -
bEaboxz = 0
=> Fa =
FGbox 1 + FGbox2
·
Examples in Lecture slide / Statically equilibrium
&v = 0 -
Vertical
& FH = 0 -
Horizontal
&M = 0 -
Moment
, Forces and equilibrium
Newton's Third Law :
The force by A the
exerted one
body on
B
other is
equal in
magnitude opposite
in direction to the force exerted by B on A
.
· When
drawing FBD replace External
,
3 Internal Forces :
↳
(Egravity
supports with reaction forces between subsystems
in
forces e .
g
:
engine car
other objects
downwards is
·
Going
+ Ve
· The sum of all rector components is O
Fres = [F j =
SUMMARY :
: O
· For 2D
analysis
-vertical equilibrium : EFv o =
-
Horizontal force equilibrium : [FH = 0
- Moment equilibrium : [Ma O =
, Moment Of A Force
EXAMPLES
· ( + 5) cW
· (-5) <W
· can choose
any point as
-a b
L
reference · Vertical
equilibrium
Fu = 0 [Ma = o
=> FGbox 1 + FGbox2 -
FA = 0 aFabox1 -
bEaboxz = 0
=> Fa =
FGbox 1 + FGbox2
·
Examples in Lecture slide / Statically equilibrium
&v = 0 -
Vertical
& FH = 0 -
Horizontal
&M = 0 -
Moment
