How Do You Calculate Thrust and Resultant Force for Saturn V Rockets?

• pluke100
In summary, the conversation is about a question regarding the specifications of the Saturn V rockets used in the Apollo space missions. The question involves calculating the force and resultant force at lift-off, using conservation of momentum and Newton's laws. The problem is vague and further clarification is needed. One of the speakers suggests finding the change in momentum of the gas ejected by the rocket in a small time interval.
pluke100
Guys got this question and couldn't do it.

The Saturn V rockets which launched the Apollo space missions had the following specifications:(look at attached pic)

Caulculate i) the force(thrust) produced at lift
ii) the resultant force acting on the rocket at lift-off

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Looks like you should use conservation of momentum and Newton's laws. What did you do?

Also, the problem is a little vague, maybe you could clear it up a little.

i haven't got an idea what to do with that :S

pluke100 said:
i haven't got an idea what to do with that :S
Change in momentum is the impulse, which for a constant force is the product of force times the duration of the force. Find the change in momentum of the gas ejected by the rocket in some small time interval Δt and go from there.

1. What is a rocket?

A rocket is a vehicle that uses a combination of fuel and thrust to propel itself through space. Rockets can be used for a variety of purposes, including satellite launches, space exploration, and military operations.

2. How does a rocket produce thrust?

A rocket produces thrust through the principle of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In a rocket, this means that as hot gases are expelled from the engine, the rocket is pushed in the opposite direction with a force known as thrust.

3. What is the difference between thrust and resultant force?

Thrust is the force that propels a rocket forward, while resultant force is the sum of all forces acting on an object. In the case of a rocket, the resultant force includes not only thrust, but also the force of gravity and air resistance.

4. How do resultant forces affect the flight of a rocket?

The resultant forces acting on a rocket determine the direction and speed of its flight. If the resultant force is greater than the force of gravity, the rocket will accelerate and gain altitude. However, if the resultant force is less than the force of gravity, the rocket will decelerate and eventually fall back to the ground.

5. How do scientists calculate resultant forces on a rocket?

To calculate resultant forces on a rocket, scientists use Newton's second law of motion, which states that force is equal to mass multiplied by acceleration. By measuring the mass of the rocket and its acceleration, scientists can determine the resultant force and make necessary adjustments to ensure a successful flight.

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