FREE BODY DIAGRAMS

 

by J. Wunderlich, Ph.D.

 

Last updated: 9/01/08 (this document may be updated throughout the semester)

Find it on-line at: http://users.etown.edu/w/wunderjt/syllabi/Free%20Body%20Diagrams.htm

 

 

 

 

 

For FYS, you should be able to tell whether or not each of the following scenarios is:

 

1.    STATIC (i.e., motionless – with the sum of forces and torques in each direction equal to zero)

 

2.    DYNAMIC (i.e., in motion -- with the sum of forces or torques in at least one direction not equal to zero)

 

3.    UNKNOWN until magnitudes are assigned to vectors, and forces & torques are summed in each direction.  You should however be able to state exactly what conditions would result in a STATIC or DYNAMIC scenario.


 

 

 

Free Body Diagram of a block on a horizontal plane

with weight( i.e., force due to gravity “g” – i.e., weight = mg) and Reactive(i.e., “normal”) force shown

See more at: http://images.google.com/imgres?imgurl=http://www.staff.amu.edu.pl/~romangoc/graphics/M3/6/free-body-diag-1.gif&imgrefurl=http://www.staff.amu.edu.pl/~romangoc/M3-6-free-body-diagram.html&h=337&w=552&sz=6&hl=en&start=2&um=1&tbnid=05RdjandSchtDM:&tbnh=81&tbnw=133&prev=/images%3Fq%3D%2522free%2Bbody%2Bdiagram%2522%2B%26ndsp%3D18%26svnum%3D10%26um%3D1%26hl%3Den%26sa%3DN

 

 

 

Free Body Diagram of a block on an inclined plane

with weight( = mg), reactive(“normal”), and friction forces shown

See more at: http://science.palomar.edu/physics/Physics230/Tutor/Tutor11.html

 

 

 

 


 

Free Body Diagram of a skier on an inclined plane

with Normal (reactive) and Weight(= mg) forces shown -- friction force not shown

See more at: http://library.thinkquest.org/25844/dynamics/inclined.htm

 

 

Figure 12.26 from course text: “Kinesiology: Scientific Basis of Human Motion”

Gymnast with Weight( = mg), Horizontal, Reactive, and Friction forces shown

 


Figure 12.27 from course text: “Kinesiology: Scientific Basis of Human Motion”

Swimmer with Weight( = mg), Buoyancy, and Drag forces shown

(Horizontal thrust of swimmer not shown)

 

 

Figure 12.26 from course text: “Kinesiology: Scientific Basis of Human Motion”

Human thigh with Hip, Muscle, Weight( = mg), and Knee forces shown

 

JUDO Free Body Diagrams (With notes by Dr. Wunderlich)

 

JUDO Free Body Diagrams (With KUZUSHI notes by Dr. Wunderlich)