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Worksheets12PEA Biomechanics
Total questions: 20
Worksheet time: 14mins
To create ideal force summation, we use 1) the sum of as many parts of the body as possible 2) in the correct order - biggest muscles to smallest muscles and 3) is what?
Greatest range of motion
Greatest force
Greatest power
Greatest engineered motion
Ideally, starting a movement with force summation, which big muscles would we engage for power?
Lower body (quadriceps, hamstrings, gluteus maximus)
Mid section (abdominals, abductors, latissimus dorsi)
Upper body (deltoids, biceps, triceps, wrist flexors)
All of them at the same time
Which is the correct definition for centre of gravity, one of the three main factors in stability and balance?
A spot around which weight is evenly balanced throughout the body. It takes on different positions as body position changes
The area beneath an object or person that makes contact with the supporting surface (ie ground)
A straight line that extends vertically through the centre of gravity into the ground
In stability and balance, one means when a person is in motion and the other means when they are in a still position. Which refers to the person in motion?
Stability
Balance
If you are running to hit a forehand in tennis, and your line of gravity is outside your base of support, which one are you?
Unbalanced
Unstable
Stable
Balanced
When trying to throw/hit/kick a ball as far as you can, what is the ideal angle of release (presuming there is no air pressure/wind)?
35-45 degrees
15-25 degrees
25-35 degrees
45-55 degrees
There are three external factors that affect projectile motion. They are gravity, air pressure/wind and what?
(a)
Which of the following is NOT one of the three main parts of projectile motion?
Angle of release
Height of release
Speed of release
Power of release
If kicking/hitting/throwing a ball into the wind and against the air pressure, would you go lower or higher with your angle of release?
Higher
Lower
One of these sports generally does not use optimal angle of release, which is around 35-45 degrees. Which one is it?
Tennis
Javelin
Basketball
Cricket
Which one of the below is Newton's First Law - the Law of Inertia?
An object will remain at rest, or in motion, unless acted upon by an external force
When a force is applied to a mass, the result is acceleration of that mass in the direction of the force applied
For every action, there is an equal and opposite reaction
Why does a tennis racquet have a greater reaction force than a table tennis racquet, even if the action force (a tennis ball) is the same?
The tennis racquet has more reaction force because of the 'trampoline' effect of the strings
A tennis racquet is bigger
A tennis racquet is made of stronger material
It doesn't
Does an object that is light/has low mass, have more or less inertia than an object that is heavy/has high mass? (Clue - an object with less inertia is easier to move)
More
Less
Name at least three external forces that act on a golf ball during the time it is hit, when it flies through the air, and when it lands.
In the equation F=M x A, what do all three words mean? (spelling is important)
(a)
In Newton's Second Law of Acceleration, if a 10kg medicine ball is thrown with the same acceleration as a basketball, which one produces more initial force?
Basketball
Medicine ball
There are three phases of a sporting movement. Which one of the below is NOT one of them?
Preparation
Execution
Follow through
Reflection
In a throw, a hit or a pass, the smallest muscles in the upper body come at the end of a movement in force summation for accuracy and execution. At the end of the arms, what are these muscles?
Wrist flexors and extensors
Triceps and biceps
Anterior and posterior deltoids
Quadriceps and hamstrings
Why are sumo wrestlers so hard to move, if we look at it in terms of stability and balance (choose all answers that are correct)?
They have a wide mass, which gives them a lower centre of gravity
They spread their feet out wide at shoulder width apart, which creates a strong base of support
They try to remain upright with their line of gravity between their base of support, and have high inertia (high mass)
In most sports, is a height of release higher above the ground considered a positive or negative for projectile motion?
Positive
Negative
