Statics
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Statics - General Physcis - Lecture Slides, Slides of Physics
Statics, Static Equilibrium, Offset Forces, Static torques, Pivot Point, the Lever, Human Lever, Stability, Forces and torques, Gravity are key points in this lecture. All important points and concepts related to physics are introduces and some explained in this course.
Typology: Slides
2012/2013
1 / 8
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Statics
Static Equilibrium
There are three conditionsfor static equilibrium.1.
The object is at rest
There is no net force
There is no net torque
v
F
F
r
Static Torques
With no rotation, torquesmust sum to zero.
A ladder leans against a wallwith friction against the floor.
Length
l
Angle
Coefficient of static friction
The sum of torques gives
-mg F
NW
F
NF
= mg
F
fr
mg
tan
tan 2 /
sin
cos ) 2 /
(
mg
F
F
mg
l
F
l
mg
NW
fr
NW
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Pivot Point
The calculation of torques isindependent of the pivot point.
Select the wall for the pivot.
-mg F
NW
F
NF
= mg
F
fr
mg
tan
tan
sin
cos ) 2 /
(
cos
mg
mg
mgl
l
mg
mgl
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Human Lever
The elbow joint is a pivot point for alever.
Assume all forces are vertical.
Levers may not reduce force.
N
330
N
400
/ )
(
0 0
B
A
M
J
M B B A A M
B B A A M M
B
A
J
M
F
F
F
F
x F x F x F
F x F x F x
F
F
F
F
Stability
When is an object in static equilibrium?
Check the forces and torques
If the torques are from gravity, find the center of mass