biomechanical movement principles pages 62 - 135
TRANSCRIPT
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Physical EducationUnit 1
AREA of study 2
Biomechanical movement principles
Pages 62 - 135
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Labs Classwork Homework Participation/Attendance (80%)
Work Requirements
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Case study analysis or data analysis◦ Week 4 - 5 (term 2)
Assessment Tasks
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Biomechanics is the study of living things from a mechanical perspective and is essentially the physics behind human movement.
The application of the laws and principles of mechanics to living organisms.(Mechanics of Sport 1997)
The science of human movement. It applies the laws of mechanics and physics to human performance. (Live It Up 2006)
What is biomechanics?
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A scientist who is involved in:◦ Human performance analysis◦ The analysis of forces in sport and physical
activities◦ How injuries occur in sport◦ Injury prevention and rehabilitative treatment
methods◦ The design and development of sporting
equipment.
What is a biomechanist?
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Cinematography Computer and digital analysis Wind tunnels Resistance pools/swimming flumes Electromyography
What technology/equipment does a biomechanist use?
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Motion Force production Application of force Newton’s three laws of motion Momentum Leverage Impact and friction Balance and stability **Equipment design**
Topics we will cover:
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KEY KNOWLEDGE KEY SKILLS Newton’s laws of motions incorporating
force, mass and weight, acceleration and inertia applied to a range of sporting and physical activities.
The application of force summation to different sports and physical activities
How is momentum conserved and transferred during different sports
Factors affecting angular motion including torque, angular velocity, momentum and moment of inertia and their application to sporting activities
The coefficient of restitution and elasticity of different sports equipment.
How does rebound velocity effect performances?
Explain the application of key biomechanical principles to a range of sporting movements by using correct terms
Investigate and interpret graphs of biomechanical principles pertaining to movements
Participate in, analyse and report on a range of practical activities that consider biomechanical principles
Use biomechanical principles to critique the effectiveness of different movements
Analyse different sporting actions to identify similarities and differences as well as the correct application of biomechanical principles to improve performance
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The body’s resistance to change its state of motion.◦ Resistance to beginning movement ◦ Resistance to changing its movement whilst
moving. The heavier an object, the greater its
inertia. Eg.
Inertia
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They’re different!
• Mass is the amount of matter an object is made up of. Mass is usually measured in kilograms.
• Weight is the force exerted on an object by gravity and is directly proportional to its mass.
Mass & Weight
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“A push or a pull acting on an object.”◦ (from this year’s text)
“Any pushing or pulling activity that tends to alter the state of motion of a body.”
Forces on the body can be internal or external.
Examples of forces...
Forces
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Gravity◦ The pull towards the centre of the earth.
Friction◦ The rubbing of the surface of one thing
against that of another. Air resistance
◦ The resistance against a body created by air. Water resistance
◦ The resistance against a body created by water.
External Forces
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Friction is the force that occurs whenever one body moves across another surface.
Friction always opposes motion.
Friction
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Occurs when two objects slide over one another.
Eg.
Sliding Friction
Rolling Friction When an object rolls across a surface. Eg.
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There are two types of internal forces: Isometric force (without motion)
◦ Muscular contractions create force without changing length or creating movement.
◦ Eg. Isotonic force (with motion)
◦ Force is sufficient enough to change the state of motion.
◦ Eg.◦ Eg.
Internal Forces
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Sub-maximal force◦ Using a less than maximal force to create a
successful, more accurate performance.◦ Eg.
Maximal force (force summation)◦ Can be achieved:1. Simultaneously, where an explosive action of
all body parts occurs at the same time.◦ Eg.2. Sequentially, where body parts move in
sequence.◦ Eg.
Internal Forces
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Lab #5 due
Friday, 3rd May
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Pages 101-102
Newton’s first law of motion◦ inertia
Newton’s second law of motion◦ Acceleration/momentum
Newton’s third law of motion◦ Action/reaction
Newton’s Laws of Motion
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‘A body will remain at rest or continue in a constant state of motion unless acted upon by an external force.”
Examples...
Newton’s First Law of Motion: Inertia
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‘A force applied to an object will produce a change in motion (acceleration) in the direction of the applied force that is directly proportional to the size of the force.’
Examples...
Newton’s Second Law of Motion: Acceleration/Momentum
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‘For every action there is an equal and opposite reaction.’
The total momentum of two objects before impact or contact will equal the total momentum after impact.
Newton’s Third Law of Motion:
Action/Reaction
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“The motion possessed by a moving body.”
Momentum = mass X velocity The greater an object’s momentum, the
further it will travel and harder it is to stop. Which has greater momentum:
◦ A marathon runner weighs 60kg and is jogging at 10kmh.
◦ A footballer weighs 90kg and is walking at 6kmh.(Momentum is measured in kg m/s)
Momentum
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•An object that is not moving has zero momentum because it has no velocity
•If two objects have the same mass but different velocities, the one moving quickest has the greater momentum
•If two objects have the same velocity but different masses, the one with the greatest mass also has the greater momentum
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Total momentum before a collision equals total momentum after the collision (but can be affected by external forces)e.g.
•A hockey stick is used to hit a stationary ball (zero momentum before being hit)•Before hitting the ball the stick has all of the momentum which is then transferred to the ball at point of impact (the stick still has momentum during the follow through)
Conservation of Momentum
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Page 106 Questions 1, 2, 3, 4 & 5
Thinking things through
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The momentum of a rotating object or body. AM = moment of inertia X angular velocity
Angular Momentum
Is a body’s resistance to beginning rotation. The greater the distance from the axis to the
end of the body (ie. to head of tennis racquet), the greater the moment of inertia.
Moment of Inertia = mass x radius2
Eg.
Moment Of Inertia
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Angular momentum is conserved when a body is in flight and there is an inverse relationship between angular velocity and moment of inertia
Conservation of Angular Momentum
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What can coaches/parents do to reduce the moment of inertia of children’s sporting equipment?
Moment of Inertia
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Impulse = force X time◦ Where force equals velocity or speed, and time is
the length of time over which the force was applied.
Impulse is the reason objects’ momentums change.
To change an object’s momentum, a force must be applied to the object over a period of time.
Impulse
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The amount of rebound potential of a ball. When a ball hits a surface it changes shape
for a short time before rebounding and returning to its previous shape.
Factors affecting CoR:◦ Contacting surfaces◦ Temperature◦ Impact velocity
Coefficient of RestitutionImpact
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CoR is calculated by using the following formula:◦ CoR = height of rebound
height of release
Object Height of release
Height of rebound
CoR
Golf ball 2m 1.6m 0.894
Tennis Ball 1m 0.6m 0.775
Coefficient of Restitution
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Ball Height of release Height of rebound Coefficient of restitution
Tennis ball 1m
Hockey ball 1m
Nerf ball 1m
Basketball 1m
Table tennis ball 1m
Soft-cross ball 1m
CoR - carpet
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Ball Height of release Height of rebound Coefficient of restitution
Tennis ball 1m
Golf ball 1m
Soccer ball 1m
Basketball 1m
Squash ball 1m
Soft-cross ball 1m
Nerf ball 1m
Table tennis ball 1m
Soft ball 1m
CoR - concrete
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Page 117
Chapter Review Questions