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## PRINCIPLES OF BIOMECHANICS

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### PRINCIPLES OF BIOMECHANICS BUILDING BLOCKS OF EXERCISE SEVEN PRINCIPLES Grouped into four(4) categories Category 1 = Stability Category 2 = Maximum Effort Category 3 ... – PowerPoint PPT presentation

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Title: PRINCIPLES OF BIOMECHANICS

1
PRINCIPLES OF BIOMECHANICS
• BUILDING BLOCKS OF EXERCISE

2
SEVEN PRINCIPLES
• Grouped into four(4) categories
• Category 1 Stability
• Category 2 Maximum Effort
• Category 3 Linear Motion
• Category 4 Angular Motion
• Pages 231 234 in textbook

3
Stability - Principle 1
• Proper stability balance are essential to
efficient movement.
• See notes on stability from earlier in unit.

4
Max Effort - Principle 2
• Production of maximum force requires the use of
all possible joint movements that contribute to
• With more joints coming into play, the more
muscles there will be to contract leading to
greater force being exerted.

5
Principle 2
• Example Throwing a ball
• Use as many body joints as possible

6
Max Effort - Principle 3
• Production of maximum velocity requires the use
of joints/muscles in order from largest to
smallest.

7
Principle 3
• Example Use legs to shoot in basketball
• Bend from legs to generate more force

8
Linear Motion Principle 4
• The greater the applied impulse or force, the
greater the increase in velocity.
• The harder you hit an object, the farther it will
travel.

9
Principle 4
• Principle of Impulse crouch before you take off
to jump.
• Reverse Impulse absorbing forces when catching
an object or landing after a jump. ( in order to
lessen the load on joints and disperse the large
forces at work)

10
Linear Motion Principle 5
• Movement usually occurs in the direction
opposite that of the applied force.
• Examples Resistance of water in swimming,
pushing off floor before jumping, etc.
• Related to Newtons 3rd Law (Reaction)

11
Angular Motion -Principle 6
• Angular motion is produced by the application of
a force acting at some distance from an axis.

12
Angular motion
13
Principle 6
• Angular velocity increases closer the object is
to the axis of rotation.
• Examples figure skating spinning, diver
spinning, throwing a curve ball.

14
Angular Motion -Principle 7
• Angular momentum is constant when an athlete or
object is free in the air (or airborne).

15
Applying PrinciplesCase 1
• You are coaching a peewee football team and you
notice that one of your 50kg linemen is getting
knocked down very easily and often. As a result,
your 9-year old all-star quarterback has suffered
his 5th concussion and is forced to eat all of
his meals through a straw.

16
Case 1
• Principle 1 Work on stability of linemen.
• Principle 3 Large to small muscles when
pushing off opponent.
• Principle 4 Hit opponent harder to protect
quarterback.
• Anything else?

17
Applying PrinciplesCase 2
• When Silken Lauman was a young rower she pulled
the oars with her arms and then pushed with her
legs, causing her boat to not travel as fast as
she would like. Somehow she became one of the
best rowers in the world.

18
Case 2
• Principle 3 Largest to smallest muscles.
Generate force from legs and then arms.
• Principle 5 Resistance of oars in watermore
efficient strokes.
• Anything else?

19
Applying PrinciplesCase 3
• Ben Johnson could run the 100m in 10 seconds.
After pumping his body full of steroids, he cut
his time to a world record time of 9.79 seconds
in 1988.

20
Case 3
• Principle 4 Greater applied force, greater the
reaction. Push off ground harder with steroids.
• Principle 5 Movement occurs in opposite
direction of applied force. Push off starting
blocks harder with steroids.
• Anything else?