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