Transcript quick quiz you know the drill!!!

QUICK QUIZ
YOU KNOW THE DRILL!!!
Books out and ready to go…..
1. What is the movement happening at the
shoulder?
2. What is the agonist?
3. What is the antagonist?
STABILITY
4. Is this little lady
stable?
Why/Why not?
- You must refer
to 3 points.
1. What is the movement happening at the
shoulder? abduction
2. What is the agonist? deltoid
3. What is the antagonist? Latissimus Dorsi &
Pectorals
STABILITY
4. Is this little lady
stable?
Why/Why not?
- You must refer to 3
points.
1. Lowered COG by
bending her knees
2. Wide BOS
3. LOG falls within
BOS
PROJECTILE MOTION
(page 122)
• As soon as an object is
thrown it becomes a
projectile
• Projectiles may include
objects such as balls,
athletic equipment such
as a shot put, the human
body (in activities such
as jumping)
SPEED OF RELEASE
• Throwing activity:
– One throw with a small effort
– One throw with a large effort
SPEED OF RELEASE
• The GREATER the speed of release, the
greater the distance covered in flight.
Slow
Throw
Distance
Fast
Throw
Distance
SPEED OF RELEASE
• The greater the speed of release, the
greater the distance covered in flight.
Slow
Throw
Distance
Fast
Throw
Distance
ANGLE OF RELEASE
• MONKEY!!!
• Experiment time!!!
• Does the angle of
release affect the
distance covered???
YOU BE THE JUDGE
ANGLE OF RELEASE
• The ideal angle of release is 45 degrees.
If the angle is greater or less, the distance
covered in flight is less.
ANGLE OF RELEASE
70
45 Degrees
25
HEIGHT OF RELEASE
• Experiment:
– One throw from the ground
– One throw from on top of a chair
HEIGHT OF RELEASE
HIGHER
• The
the level of release the
greater the distance covered in flight.
Height
Distance
FIRE HOSE EXAMPLE
FORCE SUMMATION
• Force Summation =
– The sum of all forces generated by each body
part
FORCE SUMMATION
• To get as much force as possible:
1. Use as many MUSCLES as possible e.g.
using the thighs, abdominals, forearm
2. Use the muscles in the BODY
3. Use the CORRECT SEQUENCE. This is
important so that force is transferred
from muscle to muscle
4. Stretch muscles to their full length
FORCE SUMMATION
– Momentum = Mass of Object x Velocity of
Object
– Therefore:
•
If you start momentum in the large muscles first
and this momentum is not lost and is carried to
the smaller muscles, by the time it has reached
the smaller muscles it is moving very fast
FORCE SUMMATION
–
Moving your legs
•
–
Therefore if this movement is then passed to your
trunk
•
–
12kgms (momentum) = 3 kgs (mass) x (4 m/s) Velocity
If this momentum is then passed to your arms
•
–
4kg’s (mass) x 3 m/s (velocity) = 12kgm/s (momentum)
12kgms (momentum) = 2 kgs (mass) x (6 m/s)
As you can see the velocity is getting quicker