Aeroscience Flashcards
What is velocity and a vector vs scalar
Is the distance traveled in a given direction over a unit of time. It’s The vector quantity of speed.
Vector - a quantity that has both size and direction e.g 20kt northerly
Scalar - a quantity that has only size e.g 20kt
What is inertia?
The tendency of an object to remain at rest with zero velocity or continue moving at a certain velocity. Dependent on the mass of a given object
What is momentum?
Momentum = the product of an objects mass and velocity can be known as the difficulty of stopping an object or changing its direction of travel.
If velocity of an aircraft is halved then its momentum is ?
It would decrease due to the momentum being the result of an objects mass and momentum.
State newtons three laws of motion.
First law - every object continues in its state of rest or uniform motion in a straight line unless acted upon by an external force.
Second - external force acting upon a body is proportional to the product of its mass and the acceleration produced by the force. F=ma
Third - every action theres an equal and opposite reaction.
What is acceleration?
The rate of change of velocity over time, indicating how quickly an objects speed or direction is changing.
Regards to circular motion, what’s the forced toward the centre of the turn?
Centripetal force, necessary to keep an object moving in a curved path.
What is work and power?
Work is the product of a force that moves an object through a distance and is measured in newton metres or joules. W=Fd
Power - the rate at which work is done, measured in watts.
P = w/t or fd/t
What is energy
The capacity to do work and is measured in joules.
Two most common types of energy in aviation?
Kinetic - energy due to motion, a squared relationship between velocity and Ek. If velocity is doubled Ek in useful work increases.
Ek = 1/2mass x v^2
Potential - energy due to position. Most objects at height have Gravitational Ep where the height of the object can be converted into Ek and do work.
Explain the CoG of an object?
The point where the entire weight of an object can be considered to act. Influencing its balance and stability
What is mass? And weight?
Mass - the amount of matter in an object measured in Kg.
Weight - the force exerted on an object due to gravity and the product of mass x the acceleration due to gravity (9.81).
What is a couple?
Refers to two equal and opposite forces acting at a distance from each other, creating a turning effect without a translational motion (no change in rotation or orientation)
When is an aircraft in equilibrium
When the sum of all forces acting on it (lift, drag, thrust and weight) are 0.
What is a moment?
A turning force about a pivot or turning point. M = force x arm
