2.2.2 Mechanics (Kinetics) Flashcards
What are the equations that should be used for motion?
SUVAT equations
What is the equation for distance?
Distance = Speed x Time
What is 1 radian equal to in degrees?
57.3°
2π radians = ?
360 degrees (or one revolution)
At what height or time to fall taken, does an object falling means that the air resistance is negligible?
324ft or 4.5s (or less)
What Greek letter represents angular velocity?
Omega ϴ
What Greek letter represents angular acceleration?
Alpha α
What is free vibration?
A mechanical system that is set off with an initial input, then is left to vibrate freely.
An example would be a child on a swing
What is forced vibration?
An alternating force of motion applied to a mechanical system.
An example would be a shaking washing machine.
What is resonance?
The tendency of a system to oscillate at maximum amplitude at a certain frequency. A small periodic driving force will cause large amplitude vibrations.
What is the terminal velocity of an object?
When an object falling gets to terminal velocity, it has accelerated to a constant speed (115mph) and won’t increase after this.
What is 1 revolution equal to in radians?
2π radians
In SUVAT equations, what letter does Angular Velocity (w) replace?
U + V
What is the angular velocity equation?
ω = angular displacement / time
What is the linear velocity equation? (speed equation)
V = distance / time
What is the equation that links linear velocity and angular velocity?
Linear Velocity = angular velocity x Radius
(V) = (ω) x R
What formula is used for Time Period?
T = 1 / ƒ
What is 1kW equal to in HP?
1.34HP
What happens when airflow over a curved surface of an aircraft reaches Mach 1?
Normal shockwaves form and air pressure + density rise in its wake
What happens to low speed air that passes through a convergent duct?
It increases in velocity and decreases in pressure
What is another word for the Kelvin scale?
Absolute scale
