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