Let's put the notes down. A Rocket (space transportation, launch vehicle) is a “thing” that “spits out” hot gasses, a simple yet forceful machine that propel objects into the air.
Some sort of chemical reaction occurs in closed or sealed volume (tank) that causes the escape of a gas with a high speed. Similar to a balloon!!!
“For every action there is an equal but opposite reaction”
Newton’s Third Law
Skin of the balloon is stretched tight, squeezing the air inside so it has a high pressure than than the air in the room. To equalise this pressure, the air is forced out the stem and following Newton’s 3rd law, the air is forced out (action) and an equal force pushes the balloon in the opposite direction (the reaction). Balloon flies wildly because its unstable!!! Finally, with some form of ‘control’ like adding fins we can have a small rocket!
Consider yourself sitting on a wagon armed with a bag of tomatoes aiming to me (NOT). If you are at rest and begin to throw tomatoes to me because of Newton’s 3rd law an equal but opposite force will move you (and the wagon and tomatoes) in the other direction.
Now you had to use some force to throw the tomatoes, the force moving you on the wagon is identical in magnitude but opposite in direction. From the concept of conservation of linear momentum: Change of speed of tomato (because its small) will be greater than the change in speed of the wagon.
This is how a rocket works: it expands energy to eject mass out the back at high speeds, pushing the rocket in the opposite direction. Mass is being ejected at a rate we refer to as mass flow rate:
Δm / Δt = ṁ (kg/s)
A rocket engine has three basic parts: combustion chamber, a throat and a nozzle!
It’s not that hard! In future articles and courses you will be able to learn in more and more about Rockets. GEO University opens new learning Horizons.
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