Motion
Balance and Stability
Fluid Dynamics
Force
BONUS QUESTIONS
100
Name the three types of motion
Linear, Angular and General
100
For a human standing upright, what is located approximately at their bellybutton?
Centre of Gravity
100
What are the 2 forces that affect flotation?
Gravity and buoyancy.
100
Name the two types of forces applied by the body.
Applied forces and reaction forces.
100
A line out in rugby union is an example of what type of motion?
Linear
200
What is the equation used to determine velocity?
Velocity = displacement / time
200
True or false, a narrow base of support ensures that a person's centre of gravity is close to the middle of their base of support boundary?
False - a narrow base of support causes a persons centre of gravity to fall closer to the base of support boundary edge. (this is why we lose balance easier)
200
Why doesn't the centre of buoyancy and the centre of mass (gravity) line up during a horizontal float?
Because air in the lungs draws the centre of buoyancy towards the chest whilst the centre of mass (gravity) is pulled downwards by gravity.
200
What is the equation used to determine power?
Power = work / time
200
True or false, sinking means an object displaces an amount of water that weighs more than itself.
False - floating occurs when an object displaces an amount of water that weighs more than itself.
300
What motion principle is defined as: "the rate at which velocity changes in a given amount of time"?
Acceleration
300
Why do high jumpers lower their centre of gravity and use the Fosbury Flop?
It allows them to propel their body over a longer vertical path. Their centre of gravity travels under the bar and as a result they use less effort = more efficient.
300
Name the 3 different "Magnus Effects" that cause balls to deviate from their normal flight path.
Topspin Backspin Sidespin
300
What are the 2 types of power?
Speed dominated power and strength dominated power.
300
What is the name of the swimming suit introduced by Speedo that reduced drag?
LZR Racer
400
Using the formula for speed, determine the finishing time of a 100m runner who gained a finishing time of 9.97 seconds.
Speed = Distance / Time Speed = 100m / 9.97 sec Speed = 10.03 seconds
400
True or false, the position of a person's limbs determines the location of their centre of gravity?
True - this will affect their base of support and in turn their centre of gravity.
400
Name the type of drag defined by: "a thin film of fluid medium sticking to the surface of the body or object through which it is moving"
Surface Drag
400
What is centripetal force?
Force directed towards the centre of a rotating body.
400
Where in the body are most forces absorbed?
Joints
500
When we consider the mass differences between players, the body's elasticity and players evasive skills we are addressing which motion principle?
Momentum
500
What is the balance and stability principle that can be manipulated to create movement?
Line of gravity - movement is created by imbalance. This happens when the lie of gravity goes outside the base of support.
500
What are the 3 factors that affect the body's ability to float?
1. Density of a body or object (more dense = less fat). 2. Specific density (eg. bones are very dense but lung tissue is less dense). 3. Average total body density.
500
Name the 3 considerations an individual must consider when applying force to an object.
1. Quantity of force applied to an object. 2. If an objects mass has increased. 3. Objects of greater mass require more force to move them than smaller objects.
500
Performance can be improved by minimising resistance. Name the 4 main areas that can be manipulated. They start with: T T C E
Technique - like bending forward Tactics - following closely behind others in a race (streamline) Clothing - using friction reducing material Equipment - selecting aerodynamic equipment
M
e
n
u