G - forces? (1 Viewer)

[aero135]

It says in dot point that staged rockets are used as it enable extra mass of empty fuel tanks and huge rocket engines to be discarded, lessening the mass for the second stage engines and so making thrust more effective and it also reduces the maximum g force experienced by astronauts.


My question is how can g forces be reduced. Seeing as F = ma if mass is less and force is constant, acceleration MUST INCREASE!

Thus g - force = 9.8 + acceleration over 9.8

SHOULDNT g force then INCREASE not REDUCE?

 

[cutemouse]

The THRUST is constant.

ie, F = T - mg

I see what you're trying to say. But the multi-stage rockets are designed so that the rocket's engine is shutdown after each stage, so that the G forces do not exceed the maximum g-force that the human body can handle.

That is, after one stage the engine shuts down to avoid exceeding the g-force threshold, and then the fuel container is dropped. A similar thing happens for the other stages, but the first stage experiences the greatest g-force.

 

[Pwnage101]

The THRUST is constant.

ie, F = T - mg

I see what you're trying to say. But the multi-stage rockets are designed so that the rocket's engine is shutdown after each stage, so that the G forces do not exceed the maximum g-force that the human body can handle.

That is, after one stage the engine shuts down to avoid exceeding the g-force threshold, and then the fuel container is dropped. A similar thing happens for the other stages, but the first stage experiences the greatest g-force.

/. (see here for a visual explanation of teh g-forces due to a multistage rocket)

 

[aero135]

thanks guys