INTRODUCTIONF FOR BIOMECHANICS. By Abdulgalil Allam. When we study any part of knowledge we ask ourselves these questions. What Is the application of mechanical principles on the living organisms. Why Via this science we able to solve many medical problems that face the patients How
Is the application of mechanical principles on the living organisms.
Via this science we able to solve many medical problems that face the patients
Using it on designing exercise programs, orthotics and prosthesis, application of a technique etc… even when we give an advice to a patient.
Physical quantity that tends to change state or shape of an object ( state means the speed or equilibrium). So force can generate, stop, or modify motion.
It’s unit is Newton (N).
That because it has a magnitude and direction.
Represented graphically by an arrow(vector) has four characteristics:
3-point of application tail
4-line of application angle with the horizontal (angle of pull).
The force that attract any object to the Earth.
The force by the gravity on an object is equal to its weight .
W = M x (g)
(in Newton) (in kg)
Where g=9.8m/s or =10 N/kg
(COG is an imaginary point that the body weight can be assumed to be concentrated and equally distributed.)
It’s the resistance force generated when two surfaces pressed and slide on each others.
Definition: It is the total force applied per unit area.
Measured in (N/m2 ) or pascal
force that tends to reduce or stop a moving object
As air or water resistance, it depends mostly on the surface area
Definition:(center of mass)
COG is an imaginary point that the body weight can be assumed to be concentrated and equally distributed, around which body can rotate freely in all direction.
At which summation of all moments equal zero
The COG in males is higher than in females
The different mass distribution
COG is always shifts to the heavy mass
e.g. flexion and extension