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Grade 7


Module 3

Making a rocket

Design and realise


A rocket relies on jet propulsion in order to fly. When a rocket uses its fuel, a current of warm air is exhausted at its tail causing the rocket to move forward. Planes that fly at lower than 25 km use the oxygen in the atmosphere to ignite (burn up) their fuel.

Rockets have to carry oxygen with them, because above 25 km from the earth’s surface there is not enough oxygen.

M ake a Rocket


We are now going to make a rocket that will use jet propulsion in order to move forward. The speed with which a rocket moves forward depends on the amount of propellant gas that is exhausted at the rear end. Water is a much better propellant than warm gas, because it is much heavier. We are going to use compressed water and air and will make observations regarding how high/far your rocket can fly.

Assignment 1:

To find the requirements needed for the rocket

[lo 1.10]


  • Thin cardboard.
  • A pen.
  • A ruler.
  • Coloured cardboard.
  • A pair of scissors.
  • Two empty.
  • 2ℓ plastic bottles.
  • Strong broad adhesive tape or masking tape.
  • A funnel.
  • A jug of water.
  • A cork.
  • An air valve (from a bicycle pump).
  • Plastic tube.
  • A bicycle pump.
  • A plastic bank coin pouch.
  • A protractor.
  • Glue.
  • A Stanley knife.
  • A stiletto or a knitting-needle.
  • A pair of compasses.
  • Oil-based paint.


A plane or rocket operates according to Newton’s third law of movement, namely if one source exerts a force on another, then the other source exerts the same amount of force on the first source, but in the opposite direction from the first source; i.e. for each action there is an opposite reaction.

If the force you exert on something is bigger than the resistance exerted by that object, the force that you exert can cause movement. The movement in the rocket is brought about by the rocket being pushed upward by the escaping gases that were generated as a result of the chemical reaction between the fuel and the oxygen that are burnt up in the combustion chambers. The large volume of gases escapes at a high speed through the rocket’s steel exhaust pipe.

There are five types of force that act upon a rocket, namely:

Thrust : the force provided by the engine, which is exhausted at the rear end and which pushes the rocket forward

Gravity : the force that pulls the rocket back to earth

Resistance : This is exerted by the air against the rocket, causing the rocket to reduce its speed. (Outside the atmosphere, there is no resistance, because there is no air.)

Lifting force : A rocket cannot be launched effectively and rise vertically unless the lifting force of its engines is greater than the weight of the rocket.

Relative wind : The air flows rapidly around the nose and down the body. Longer nose-pieces are used to get better airflow.

Assignment 2:

To do research on the fins of a rocket

[lo 1.7]


A rocket needs fins in order to fly in a straight line. Do research about what the fins of a rocket look like and draw a few examples in the space provided. Also decide how many fins you would like to use and what size the fins will have to be in relation to the body section of the rocket. Also, decide what type of material will be the most suitable for making the fins. The position of the fins on the body is also extremely important.

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Technology grade 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11032/1.1
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