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FORCE
1. FORCE
Prof. Dr. M. Rajesh, PT, M.P.T(cardio), B.C.R.C
TRINITY MISSION AND MEDICAL FOUNDATION
MADURAI
2. INTRODUCTION
Force is that which alters the state of rest of a body or its
uniform motion in a straight line
3. COMPOSITION OF FORCES
The application of force to a body is specified by-
The direction of the force: this may be represented by the
direction of an arrow
The magnitude of the force: this may be represented by the
length of the arrow
The tail of the arrow drawn to represent a force can be taken as
the point of application of that force.
4. Two forces acting in the same direction and at a common point
are equivalent to a single force acting in that direction, whose
magnitude is equal to the sum of the magnitude of the
individual forces.
5. Two equal forces acting at a common point, and in opposite
directions, will result in a state of equilibrium.
6. A two unequal forces acting at a common point and in opposite
directions will result in movement in the direction of the greater
force, the magnitude of the force producing this movement
being equal to the difference between the magnitudes of the
two unequal forces which oppose each other.
7. Much of the Physiotherapists work involves the application of
forces to oppose, equal ore augment the forces of muscles action
and of gravity acting upon the human body
8. Sometimes it is inconvenient to apply force in a particular
direction and in these circumstances tow forces acting at an
angle to each other may be compounded to produce the desired
effect.
9. If two forces represented by the lines AB and AC act at A, then
the diagonal AX of the parallelogram ABXC represents the force
to which they are equivalent. One example of this occurs when
the Deltoid muscle contracts during shoulder abduction, the
action of the anterior and posterior fibers of the muscle being
compounded to work with the middle fibers and so vastly
increasing their power.
10.
11. The principle of compounding forces is also employed in some
arrangements for balanced traction.
Two unequal forces acting at different points and in opposite
directions produce rotation of the body.
One example of this occurs when the Trapeziums muscle and
Serrutus anterior muscle contrac to rotate the scapula.
12.
13. THANK YOU
Prof. Dr. M. RAJESH, PT,M.P.T(cardio),B.C.R.C
TRINITY MISSIOIN AND MEDICAL FOUNDATION
MADURAI.
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