Mass of the rocket doesnt stay constant

In summary, the conversation discussed the difficulty of studying rockets in physics class due to the changing mass and the need to factor in fuel weight and relativity. The speaker also suggests using conservation of momentum as a helpful tip.
  • #1
spri4
5
0
My physics class is ending the year with the study of rockets. He said it will be one of the most difficult studys of physics because the mass of the rocket doesn't stay constant. What do you think? Any hints/tips you would like to share? Thank you.
 
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  • #2
Hints? Tips? ummmmmmmm... PAY ATTENTION ;)

But seriously it shouldn't be that hard, you just have to factor in how much weight in fuel the rockets are averaging over 3 stages in flight (take off, level flight, descent) as each will be different. But, then we should also remember relativity, which states that mass increases as speed increases, and that size (in the direction of thrust) also becomes smaller.
 
  • #3
AzonicZeniths said:
Hints? Tips? ummmmmmmm... PAY ATTENTION ;)

But seriously it shouldn't be that hard, you just have to factor in how much weight in fuel the rockets are averaging over 3 stages in flight (take off, level flight, descent) as each will be different. But, then we should also remember relativity, which states that mass increases as speed increases, and that size (in the direction of thrust) also becomes smaller.

I don't think relativity will be in this class
 
  • #4
Use conservation of momentum.
 

1. Why doesn't the mass of the rocket stay constant during flight?

The mass of the rocket changes during flight due to several factors such as fuel consumption, ejection of exhaust gases, and detachment of rocket stages. As fuel is burned and exhaust gases are expelled, the overall mass of the rocket decreases.

2. How does the change in mass of the rocket affect its trajectory?

The change in mass of the rocket affects its trajectory by altering its acceleration. As the mass decreases, the rocket's acceleration increases due to the conservation of momentum. This can result in a change in the rocket's direction or speed.

3. Can the mass of the rocket be controlled during flight?

Yes, the mass of the rocket can be controlled during flight by adjusting the amount of fuel loaded, as well as the timing and sequence of stage separations. This allows for better control of the rocket's trajectory and ensures a successful flight.

4. How does the mass of the rocket affect its overall performance?

The mass of the rocket plays a crucial role in its overall performance. A lighter rocket with a lower mass can achieve higher speeds and altitudes, while a heavier rocket may have a slower acceleration and limited range. Therefore, careful consideration is given to the mass of the rocket during its design and construction.

5. Is the change in mass of the rocket significant during flight?

Yes, the change in mass of the rocket during flight is significant and must be carefully calculated and monitored. Any miscalculations or unexpected changes in mass could result in a failed mission or even a catastrophic failure of the rocket. This is why precise measurements and calculations are crucial in the design and launch of a rocket.

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