Basics Flashcards
Give the equation of Potential energy
Ep = mgh
Give the equation for Kinetic energy
Ek = 1/2 mV^2
Give the equation for force
F = ma
Give the equation for momentum
Momentum = mv
Give the equation for work
Work = F x D
Define work
The energy used to displace an object
Give the equation for power
(F x D)/t
D/t = Speed
THEREFORE
Power proportional to speed
Give the definition for pressure
P = Force/area
Define dynamic pressure
Pressure on the move
Like the pressure on your hand when you put it out the window of a car
Define static pressure
Pressure that is immobile
The weight of the air acting down
Give the equation for dynamic pressure
Dynamic = 1/2 ρV^2
Give the equation for total pressure
Total P = Stat P + Dyn P
Convert the rate of 1m/s into ft/min
m/s = (m->ft) x (sec -> min)
1m/s = 3.28 x 60
= 196.8 ft/min
What is the drawback of a propellor on an aircraft?
The air at the tip of the propellor can begin to be moved faster than the speed of sound
This will cause shockwaves to form, which restricts airflow - leading onto a decrease in available thrust
Therefore, propellor-driven aircraft are much more efficient at slower speeds
What does a low Reynolds number represent?
A smooth fluid (laminar)
