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67 Cards in this Set

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What are the two downward forces acting upon your rocket?
Drag, and thrust
This law says, "the faster a fluid moves, the lwer pressure it exerts"
Bernoullis principle
If you were doing a rough sand job which sand paper would you use?
100
If you were doing a final sanding what sandpaper would you use?
600
The Engine is responsible for producing what force acting on a rocket?
thrust
The fins are resposible for producing what major force acting on a rocket?
lift
Would the rocket go higher or lower if it was in a tank of vacaline then if it was in an archer field
lower
The force that pulls down on the mass of any object near the earth though its center of gravity...
Gravity
Which sides do you sand
the leading edge and the tip
Which side do you tapper?
Trailing edge
What is a speed at any given moment?
instantanious speed
Which law states "energy cannnot be created or destoryed, it may be transfored from one form to another.."
Law of concervation
What does a horiontal line, anywhere but the origin, on a velocity vs. time graph represent?
moving at a constant spped
What can potential energy be stored in?
food, fuelm stretchinG a rubber band, compressing a spring
What does the slope of the curve on a distances vs. time represent?
speed
speed=
distance/time
time=
distance/speed
distance=
speed*time
acelleration=
v2-v1/T
velocity=
distonce/time
If the direction and speed are constance then it has a _________.
Constant velocity
The ttal distance divided by time interval is the___.
average speed
When you look at the cars speedometer you see the____.
instantaeous speed
Linear motion is______.
motion along a straight line
which axis is the dependent variable
y axis
which axis is the independent variable?
X axis
What is acceleration?
the rate at which velocity is changing
what is rate
quality/time
Relative
in regard to..
Changing Velocity
either the change in speed or direction
ex. a curvy road
Explan Newtons law fo momentom conservation
mementom remains constant, it is never created or destroyed
Explain newtons law of intertia (1st law)
rests tends to stay at rest, motion stays in motion
explain Newtons 2nd law
forces acts on a body, it is acclerated in the direction of the force
Explain newtons 3rd law (action and reaction)
when the first object hits the second, the second, has just as much energy as the 1st and pushes it back on the 1st
Explain Newtons law of conservation of Energy
energy cannot be created or destroyed but transsfored
Momentum
MASS X VELOCITY
Velocity
how fast an object is moving
Potential Energy
energy that can be stored in like rubber bands ect.
Mechanical Energy
Energy due to its motion or stored energy
Energy
ablity to work
Force
a push or pull
Inertia
if at reast stays at rest, if moving stays moving
Mass
the amount of matter that is contained by an object
Centripetal force requirment
an imward force acting upon an objject that is moving in a circle.
Kinetic Energy
Energy of motion
Four basic forces
drag
lift
thrust gravity
What fin do we use?
swept tappered
which sides do you tapper?
the trailing edge
which sides do you round?
leading edge and tip
what are the four types of fins?
eliptical
rectangular
swept tappered
straight tappered
The force experienced by any ovject moving through a fluid
drag
the retarding forcre produced by an object sliding past the molecules of the fluid which it is moving
friction drag
a forward propulsive force that moves an object
thrust
The study of motion of air and the relative motion between air and objects in the air
aeridynamics
What makes drag increase?
larger and rougher surface
thicker fluid
faster the object is moving
Things that effect friction drag
surface area
roughness of surface
density of fluid
Viscosity
mesures resistance too motion in a fluid
HOney has a ____ viscosity
high
Vacuum
absence of air
In a Vacuum would a feather or a coin drop faster
same
If a object reaches terminal velocity, then how much does it weigh and how much air resistance does it have?
there equal
3 criteria for a good recovery system
wind conditions
safe returns
suitability for rocket type
Feather Weight Recovery
Pro:
Limits the terminal energy
Con:
Has to have a low mass
Tumble Recovery
pro:
creates extremly high drag
can reuse
good for multiple stage rockets
Con:
the rate of decent is alot higher
Streamer Recovery
pro:
good on windy days
con: it cant be used for heavy rockkets
Parachute recovery
PRO:
creates tremendoius drag
con:
can burn
not good for windy days
Glide Recovery
pro:
flys esily and decends very slow
con:
can get caught in thermal winds
needs large decent area