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The study of C.G. helps us understand biology better
Center Of Gravity Help Us To: Understand why animals and plants evolved to what they
are now How our body react to change in external conditions to
avoid physical damage
Centers Of Gravity (C.G.)
•The basics•Balance in the human body•Balance in animals•“Balance” in plants
•Y ellow spot indicates Center Of Gravity
T1. The smaller the base area, the less stable the object.2. The further away the C.G. is from the base of support, the less
stable it is.
Force Exerted T
The “T” topples
•Y ellow spot indicates Center Of Gravity
T1. The bigger the base area, the more stable the object.2. The closer the C.G. is to the base of the support, the more
stable it is. TForce Exerted T
The “T” tilts The “T” returns to its original position
The human body is designed for balance,1. The human’s inner ear controls balance.2. The body has a relative large base. (Our legs are wide and
flat)3. We have a straight body (when standing) which is in line
with our centres of gravity.
Walking and Commuting etc Martial Arts – Judo The Arts – Dancing & Acrobatic Arts Military Training – Foot Drills
Everyday commuting Most of us take the Mass Rapid Transit (MRT)
to school A ny when standing in the train we often stand
with our legs spread out to shoulder length This is a natural reaction by our body to
maintain our balance when we experience turbulence
We even try to hold on to railings These would give us a wider base & lower our
centre of gravity to our base Thus giving us more stability
Martial artists use the applications of centre of gravity to improve themselves in combat
1. Widening their feet to widen the area of covered base.
2. Bending down slightly to lower their centre of gravity, hence making it closer to their base..
The above points increases the stability of the individual
The Natural World Our world is a wonderful place. Strange animals exist
in every corner of our Earth. Each with different features to help them survive in
their habitat But with these features, the animal’s balance would
be affected Therefore their bodies are designed to counter
balance the effects of these features
Balancing In Animals Animals
The ostrich stands on two legs, these 2 legs are extremely muscular, thin and long. This allows them to run faster. In addition, they can also sometimes stand on only 1 leg. These legs are capable of supporting the ostrich’s weight.
The 4 legged animals, most of these animals uses there 4 strong legs that allow them to run fast either to catch prey or escape for a predator .
The Ostrich (Birds) The ostrich has an awkward body
structure. Most of its body mass is above its long and thin legs.
Leaning forward to shift its C.G. so as to balance itself.
Having its long neck and head ahead of its body
This counter balance the weight of the Ostrich
Four Legged Animals Probably the animals that have the best
balance. Having 4 legs give them a extremely wide
base of support And most 4 legged animals are short, thus
their center of gravity is very close to their base or feet
In doing so, they are able to achieve equilibrium.
Most of them have tails which also help them balance due to the weight of their head.
It also helps them to maintain balance when running
Centre of gravity In Plants Plants also grow to achieve stability In small plants, they have roots that
do not penetrate deep into the ground. But they have thin and slender stems while their roots are spread wide
Giving the plants a wide base and their centre of gravity is closer to their base
Therefore allowing small plants to achieve stability
What About Tall Trees? Trees grow tall, in order to compete with each other
for more sunlight. However their Centre of Gravity becomes further
away from their base So they have roots that penetrate deep in to the
ground and hold tight to the soil Thus allowing them to remain upright
Credits http://www.gutenberg.org/files/20778/20778-
h/images/tree-tn.png http://www.terracelibrary.ca/kid_files/webpages/yellow%
20ducks/kitten%20and%20ducks.jpg http://z.about.com/d/healing/1/0/Y /N/gtotem_ostrich.jpg http://www.stuff.co.nz/images/699583.jpg http://www.cathouse-fcc.org/gifs-jpegs/zulurun.jpg
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