Term
|
Definition
–Roughness of surface
•Clothing worn by athletes
–Viscosity of the fluid
•Hard to change in sport |
|
|
Term
|
Definition
| –Want the fluid to roll over the surface of the object |
|
|
Term
|
Definition
•Reduces relative velocity
•Velocity is a large contributor to drag |
|
|
Term
|
Definition
| •Acts perpendicular to the relative motion of the object and the fluid. |
|
|
Term
|
Definition
•Faster moving fluids exert less pressure than slower moving fluids.
•Fluids on the curved surface are moving faster than on the straight surface |
|
|
Term
|
Definition
–Due to the immersion in a fluid
–ALWAYS acts upward
-In water: The water below you pushes up on you |
|
|
Term
|
Definition
–Due to the relative motion in the fluid
–Drag Forces
–Lift Forces |
|
|
Term
|
Definition
Definition
–The product of force and displacement in the direction of that force. It is the means by which energy is transferred from one object to another. |
|
|
Term
|
Definition
•Definition
–The capacity to do work.
–2 types: Potential Energy & Kinetic Energy |
|
|
Term
|
Definition
Definition
–The capacity to do work due to an objects position. (gravitational potential energy)
•Variables
PE = m * g * h
•Interaction of Variables
–Gravity is constant. m and h are inversely related. |
|
|
Term
|
Definition
•Definition
–The capacity to do work due to an objects motion.
•Variables
KE = ½ * m * v2
•Interaction of Variables
–m and v are inversely proportional. |
|
|
Term
|
Definition
•Definition
–The capacity to do work due the deformation of an object. A type of potential energy.
•Variables
SE = ½ * k * x2
k is the stiffness of the material
X is the deformation of the object
•Interaction of Variables
–k and x are inversely proportional. |
|
|
Term
|
Definition
•Work is the means by which energy is transferred from one object to another.
•A discus thrower does work and transfers energy to the discus.
•A pole vaulterdoes work on the pole and transfers energy to the pole, which then vaults the athlete. |
|
|
Term
| Doing Work to increase Energy |
|
Definition
•Want to increase Kinetic Energy so we apply Work (Force over a distance).
•Similar to Impulse - Momentum |
|
|
Term
| Work to Decrease (Absorb) Energy |
|
Definition
•Similar to Impulse –Momentum –Impulse
–You cannot reduce the final (landing) Impulse but you can change the F and t variables.
–For Energy –Work
•You can increase the distance over which the force is applied to Absorb the energy at landing.
•Examples
–“giving” when catching a ball
–Soft landing
–Eccentric contractions of your muscles |
|
|
Term
|
Definition
•Definition
–Rate of doing work.
•Variables
P = U / t
•Interaction of Variables
–To increase Power you must either increase the Work (U) or decrease the time (t)
•Units of Measure
–W (watt) J/s |
|
|
Term
|
Definition
•Power
–force-velocity
–1/3 max velocity
–Any adaptation that affects max force or max velocity AFFECTS power |
|
|
