Year 2 - Biomech: Fluid mechanics & Projectile Motion Flashcards
What is drag?
Force that opposes the direction of motion of a body through the water
What are the four main factors that affect the magnitude of air resistance and drag on a body?
- Velocity
- Frontal cross sectional area
- Streamlining
- Surface characteristics
Name some ways an athlete can reduce drag and air resistance through surface characteristics
Lycra clothing, shaving limbs, wear smooth helmets and other equipment
What are the 4 primary factors that influence the horizontal distance of a projectile?
- Speed of release
- Angle of release
- Height of release
- Aerodynamic factors (Magnus and Bernoulli)
The optimum angle of release is 45 degrees when starting at 0m in height. If you were throwing from below 0m in height, would you have to increase or decrease the angle of release to reach the same horizontal distance?
Increase the angle of release
What is a parabolic flight path?
A uniform curve symmetrical about it highest point caused by weight being the dominant force
What is the resultant force?
The same of all forces acting on a body, or the net force acting on a projectile
How would you show lift force on a free body diagram?
Upward arrow the meets the weight line
What is considered the optimal angle of attack for a projectile to act as an aero Foil?
17 degrees
What sport makes the most of downward lift force?
F1
To create lift force a high velocity of air moves over the top of an aerofoil. What does this do to the air pressure above the aerofoil?
Low air pressure travels over the top of the aerofoil
How does the Bernoulli principle work?
Low velocity air travels under an aerofoil which increases air pressure. Gas moves from an area of high to low pressure causing lift
