what will happen if everybody in the plane jump from a certain height inside the plane when it is flying?
If everyone inside an airplane jumps simultaneously while it is flying, the effect on the plane will be negligible, and here's why:
1️⃣ Conservation of Momentum 🛫
An airplane is a closed system, meaning that if everyone jumps at the same time, their total momentum is transferred inside the plane itself. The overall motion of the plane remains unchanged because:
- Newton’s Third Law: "For every action, there is an equal and opposite reaction."
- When people push down to jump, they exert force on the plane's floor.
- The plane absorbs this force just like it absorbs turbulence.
💡 Result? No noticeable effect on the plane’s flight.
2️⃣ Change in Weight Distribution ⚖️
If all passengers suddenly jump, there could be a tiny shift in the center of mass, but modern airplanes are designed to handle such small weight redistributions.
- Commercial jets weigh 100+ tons, while total passengers weigh at most 10-20 tons.
- The engines continuously adjust thrust, altitude, and stability.
- The plane might vibrate slightly but will not change altitude or speed significantly.
💡 Result? A small, brief fluctuation—nothing dramatic.
3️⃣ Air Turbulence Effect 🌪️
If many people jump at the same time, the air inside the cabin might get disturbed, creating a slight turbulence-like effect.
However, airplane cabins are pressurized and have ventilation systems that adjust airflow, preventing any major effects.
💡 Result? A brief air disturbance, similar to turbulence.
4️⃣ What About Microgravity? 🚀
Some people wonder if jumping could make passengers experience weightlessness for a moment (like astronauts).
The answer is NO, because:
- The plane is not in freefall like a zero-gravity aircraft.
- The force of gravity quickly pulls everyone back down to the floor.
💡 Result? You land back immediately—no floating effect.
🔍 What Would It Take to Affect the Plane?
For a real effect, you would need hundreds of people jumping with precise timing on a small aircraft, or an intentional shift in cargo weight on a cargo plane.
🔹 Military planes & cargo jets are designed to account for shifts in weight.
🔹 Pilots train for center-of-gravity changes, especially during paratrooper drops.
🚀 Conclusion:
✔️ If everyone jumps at the same time, the plane will not be affected significantly.
✔️ The force is absorbed by the aircraft structure, and its momentum remains constant.
✔️ It’s just a fun thought experiment, but nothing dramatic will happen!
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When all the food and drinks are served inside the plane, will the plane's weight decrease or remains the same (considering there is no change in the weight of the fuel)?
The total weight of the plane remains the same after all the food and drinks are served inside the plane. Here’s why:
1️⃣ Conservation of Mass (No Mass Leaves or Enters)
The law of conservation of mass states that mass cannot be created or destroyed in a closed system unless something is added or removed.
- Before serving: Food and drinks are stored in carts and containers inside the plane.
- After serving: The same food and drinks are now in passengers' stomachs or placed on trays.
- Nothing leaves the aircraft (except in rare cases where waste is discarded outside, which airlines don't typically do mid-flight).
💡 Conclusion: No mass leaves or enters → total weight remains the same.
2️⃣ Redistribution of Weight (Not Reduction)
While weight distribution changes, it doesn’t affect the total weight of the aircraft.
- Initially, food is concentrated in the galley storage.
- Once served, it is distributed among passengers.
- The plane's center of gravity might shift slightly, but this does not decrease its weight.
💡 Conclusion: Weight is just redistributed inside the aircraft.
3️⃣ What Happens After Passengers Eat?
Even after passengers consume food:
- The food still exists (inside their bodies).
- The total mass of passengers + plane remains the same.
- Even after digestion, the mass remains on board until it is expelled as waste later on the ground.
💡 Conclusion: Eating food doesn’t make the plane lighter.
🔍 When Would the Plane’s Weight Actually Decrease?
The plane’s weight only decreases if mass is removed, such as:
✔️ Fuel Burn: Fuel consumption reduces weight over time.
✔️ Waste Disposal: If a plane dumps waste (rarely done in-flight).
✔️ Cargo Unloading: If something is physically removed from the aircraft.
🚀 Final Answer:
✔️ Serving food and drinks does NOT decrease the plane’s weight.
✔️ The weight is just redistributed across the plane.
✔️ The only major factor reducing weight is fuel consumption.
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