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Understanding Rocket Mechanics: Thrust, Kinetic Energy, and Distance Travelled

This detailed overview of a simplified rocket model explores how rockets propel themselves into the air. It discusses the concept of thrust generated by the burning of fuel, resulting in kinetic energy. Using a practical example, we calculate thrust in Newtons over time and analyze the relationship between work done by the rocket engine, acceleration, and distance traveled. With a focus on fundamental physics concepts, this explanation combines theoretical foundations with practical applications to illustrate the dynamics of rocket flight.

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Understanding Rocket Mechanics: Thrust, Kinetic Energy, and Distance Travelled

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Presentation Transcript

  1. A Simple Model of a Rocket

  2. How it gets into the air • The engine produces thrust from burning of powder • The trust from the burning of the powder results in kinetic energy.

  3. First … Thrust • Thrust is in Newtons for a giventime • To clarify use a simplified curve • 8 Newtons for 1.8 seconds • This is like a finger pushing the rocket into the air

  4. Kinetic Energy and Work Done • Kinetic Energy • Work by a constant applied force: • So then the change in kinetic energy is: • The result is that the work done by the rocket engine, we are looking at it as a constant applied force is then turned into kinetic energy

  5. First Part of the Model • Launch, and powered ascent • Launch occurs at time t=0 • End of poweredascent is at • T=0, K=0 • Work done byengine results inat

  6. Need to Find • The engine burns for 1.8 seconds • Free body diagram: or With the mass of the rocket at ~80g But now we have a value for constant acceleration …… we want distance

  7. The result of this exercise … • The distance an object travels is • The acceleration is related to the velocity, and we know the time (1.8 seconds) • From calculus and physics What does this mean for us?

  8. We will do this graphically • At time zero, the rocket is standing still • At time the rocket has been accelerating for 0.1 sec and, in this case, . • Every 0.1second thespeed increasesby

  9. So how far did we go? • Remember, this is only a model up to , or 1.8 seconds • For example (not the answer) the average velocity is for 1.8 seconds • The distance is • Why did wewant this?

  10. The work done is converted to kinetic energy …. • Work done with: and: And Now you do it!!!

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