Презентация The mechanics in biomechanics онлайн

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  • Тип файла:
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    35 слайдов
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    1,2,3,4,5,6,7,8,9,10,11
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Слайды и текст к этой презентации:

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Outline Mechanics and its
Содержание слайда: Outline Mechanics and its application to biological systems Forms of motion Levers Balance and center of gravity

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How Did It Walk?
Содержание слайда: How Did It Walk?

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How Did It Walk?
Содержание слайда: How Did It Walk?

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Mechanics and Biomechanics
Содержание слайда: Mechanics and Biomechanics Mechanics: science that deals with physical energy and forces and their effect on objects Biomechanics - study of the mechanics as it relates to the functional and anatomical analysis of biological systems and especially humans

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The First Class of Levers
Содержание слайда: The First Class of Levers First class Levers In a first class lever the fulcrum is between the effort and the resistance. This type of lever can increase the effects of the effort and the speed of a body. Also good for keeping balance.

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First Class Lever
Содержание слайда: First Class Lever

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The Second Class of Levers
Содержание слайда: The Second Class of Levers Second class levers Here the resistance is between the fulcrum and the effort. This type of lever is generally thought to increase only the effect of the effort force.

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Second Class Lever
Содержание слайда: Second Class Lever

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The Third Class of Levers
Содержание слайда: The Third Class of Levers Third class Levers Here the effort is between the fulcrum and the resistance and can be seen in the. They can increase the body’s ability to move quickly but in terms of applying force they are very inefficient.

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Third Class Lever
Содержание слайда: Third Class Lever

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Human Body Levers Human s
Содержание слайда: Human Body Levers Human’s levers are mostly built for speed and range of movement at expense of force Thus, short force arms and long resistance arms require great muscular strength for movement Examples: biceps and triceps attachments biceps force arm is 1 to 2 inches (1inch=2.54cm) triceps force arm is less than 1 inch

№22 слайд
Example . How much force in
Содержание слайда: Example 1. How much force (in kg) needs to be applied to move 45 kg when the RA is 0.25 m and the EA is 0.05 meters? Use the formula FE x EA = FR x RA Note: kgs are not units of force, but sometimes force is divided by g(9.8m/s2) and expressed in kilograms.

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Example FE x . meters kg x .
Содержание слайда: Example FE x 0.05 meters = 45 kg x 0.25 meters FE x 0.05 = 11.25 kg FE = 225 Kg

№24 слайд
Lever Length Where is the
Содержание слайда: Lever Length Where is the velocity or speed the greatest; at A’ or B’? How can this principle be applied to tennis?

№25 слайд
Lever Length A longer lever
Содержание слайда: Lever Length A longer lever increases the speed at the end of the racquet unless the extra weight is too great. Then the speed may actually be slower.

№26 слайд
Stability Center of gravity
Содержание слайда: Stability Center of gravity (CG): Point at which all parts of a body are equally balanced Base of support (BOS): Area within an object’s point of contact with the ground Line of gravity (LOG): Direct line from the center of gravity to the ground

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Center of Gravity
Содержание слайда: Center of Gravity

№28 слайд
Base of support The BOS area
Содержание слайда: Base of support The BOS area can be changed Larger BOS area is typical for more stable positions In humans, wide BOS is usually accompanied by low CG

№29 слайд
Line of Gravity The line of
Содержание слайда: Line of Gravity The line of gravity is always vertical The LOG must outside the base of support to initiate or continue movement The further away the LOG from the BOS, the greater the tendency to move in that direction

№30 слайд
Stability Someone is more
Содержание слайда: Stability Someone is more __________when they have a _______centre of _______, a ______ base of __________ and a line of gravity that falls _______the body.

№31 слайд
Advantages Disadvantages to
Содержание слайда: Advantages/Disadvantages to Bipedal Locomotion Disadvantages Loss of speed Loss of agility Loss of stability Advantages Carry food Carry tools Increased ability to nurture/protect offspring

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Interesting Fact T Rex Arms
Содержание слайда: Interesting Fact: T Rex Arms How much could T Rex lift with its arm? (50x6=300lbs 136kg) ?

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