Rocket Project Flashacards
after the engine turns off what is the acceleration of the rocket?
-10m/s^2
When the rocket reaches its maximum height, what is the velocity of the rocket?
0 m/s
mass of engine a
17g
mass of engine b
20g
mass of engine c
26g
mass of rocket
36g
acceleration when rocket is off
A= -g/m
Given a Force vs Time graph for your rocket, you must find this to determine the Impulse of the rocket engine
Area
Which one (area or slope) has the same units as velocity?
Area
how do you find the a vs t graph from a F vs t graph
DIVIDE BY MASS
What are two ways to find the max height from the vf
EQUATIONS: Vf^2=Vo^2+2a (triangley) or KE=1/2mv^2 =>PEg= mgh (conservation of energy)
Once the engine turns off, what force takes over?
Fg
The reason we could not use I = Ft to determine the impulse of the rocket engine.
Force was not constant
The free-body diagram of the rocket while the engine is on
Ft thrust<---m-->Fg
Three types of energy a rocket in flight with the engine on can have (Note: there are more than three to choose from)
Gravitational PE KE Heat Chemical PE Light Sound
When the rocket engine shuts off, only this force affects its motion
Gravity
how to find the max take off velocity
I(engine)= m(engine)Vf(engine)-m(engine)Vo(engine)
If the resistance in a circuit decreases while the voltage is constant, the current will:
INCREASE
law of conservation to energy
Law that states the total energy of a system always remains constant
The location in the rocket's trajectory when it has a velocity of zero
Maximum height
in an accel versus time graph, when is the rocket falling down
NA
when is the max height on an accel versus time graph
NA
Immediately after the engine runs out of fuel, is the velocity zero?
No because after it runs out of fuel the velocity is not 0 because it decelerates until the acceleration becomes -10 m/s^2 and constant.
The units of the area under a Force vs Time graph
Ns
If the current through a light-bulb is 0 A, the light will be:
OFF
why does the accel v time graph do or doesn't match the accel v time graph
One of the things that is different are the time intervals because we graphed them ourselves versus the accel vs time with was a graph in real time. It's also different because when the graph goes speeding up when the graph goes up and slowing down when the graph how's down. Whereas for the accel vs time graph it's speeding up when its positive. and the same thing goes for moving up and falling down. Also, it's moving up the whole time just like the accel versus time. The max height is the last time interval like the accel versus time graph.
Once the rocket runs out of fuel, what is the acceleration of the rocket?
The acceleration decelerates and then becomes constant at -10 m/s^2.
why might there be a difference in the max height for different pts of the lab
The measured graph was different than the other two graphs because the Altatrack could have been tilted. Also the gun only measured up to 70 degrees and ours were more than that so it would have been more. Also there could have been wind and air resistance making the answers wrong.
why are short circuit dnagerous
Too much current runs, causing a lot of heat!= fire
Is there a point in the rocket's trajectory that will have zero velocity?
When the acceleration is 0 the velocity is 0 and max height
When looking at the Velocity vs Time graph for the rocket, this point on the graph tells us the time when the rocket reaches its maximum height
When the graph hits the x-axis (or velocity of zero)
how to find the height from the launch
[tan(angle)= h/ distance from rocket]+2
The equation for the acceleration of the rocket while the engine is on
a = FT/m- g
explain the structure of an accel v time graph
all the way up, then a bit down, then flat, then all the at down past the line to -10, then flat
the slope of a v vs t graph
an a vs t graph
Which one (area or slope) has the same units as displacement?
area
how do you find the x vs t graph from the v vs t graph
area
total impulse
area of an f vs t graph
in a v vs t graph what when is the rocket speeding up
beginning time till max v
in an accel versus time graph, when is the rocket moving up
beginning- NA
another word for impulse is
change in momentum(p)
Area of a F vs t graph gives you
impulse
What are the units of the area of the velocity vs time graph?
m
FBD when the rocket is off
m--->Fg
What are the units of the area of the acceleration vs time graph.
m/s
The units for the slope of a velocity vs time graph
m/s^2
What are the units of the slope of the velocity vs time graph?
m/s^2
What are the units of the slope of the acceleration vs time graph?
m/s^3
in a v vs t graph what when is the rocket slowing down
max v till end time
what are the units of impulse
n*s
does a short circuit mean the light is on or off and what does it do the current
off and it generates the highest amt of current
how do you find the vf from triangle p
p = mv
how do you find the max height from the x vs t graph
read the data pts
how do you find the vf from the v vs t graph
read the data pts
what should the rocket be doing before i turns on
standing still on the ground(at rest)- a =0 m/s^2
how to find the thrust duration
subtract beginning time from the end time
how to find the max thrust
the highest pt on the f vs t graph
when doe the rocket reach its max height on a v vs t graph
the last time interval
in a v vs t graph what when is the rocket falling down
the last time interval and after
in an accel versus time graph, when is the rocket slowing down
the last time interval and after
in a v vs t graph what when is the rocket moving up
the whole time
in an accel versus time graph, when is the rocket speeding up?
the whole time
on a position v time grpah what is the similarity between the velicuty versus time graph
they have the same types of graph
The area in an Acceleration vs Time graph shows
trianglel v ( change in velocity )
what is another equation for change in momentum
trianglep = mVf-mVo
Area of an a vs t graph gives you
v vs t graph
slope of a x vs t graph
v vs t graph
Given the velocity of the rocket the moment the engine shuts off, this one equation helps find maximum height
vf^2 = vo^2 + 2ax
what is the relationship between net force and acceleration
ΣF= ma
