Is Archimedes principle violative of Newton's 3rd law of motion?

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SUMMARY

The discussion centers on the apparent conflict between Archimedes' principle and Newton's third law of motion. When a heavier body with a density greater than water is submerged, it experiences an upward thrust equal to its weight, yet it sinks, leading to questions about the validity of Newton's third law. The conversation also touches on the inability to move a vehicle from within by pushing, contrasting with the effectiveness of external force. The resolution lies in understanding the force vectors involved in these scenarios.

PREREQUISITES
  • Understanding of Newton's Third Law of Motion
  • Familiarity with Archimedes' Principle
  • Basic knowledge of force vectors
  • Concept of buoyancy in fluids
NEXT STEPS
  • Study the relationship between buoyancy and density in fluid mechanics
  • Explore detailed examples of Newton's Third Law in various contexts
  • Investigate the implications of force vectors in different physical scenarios
  • Review case studies demonstrating Archimedes' principle in real-world applications
USEFUL FOR

Students of physics, educators teaching mechanics, and anyone interested in the principles of motion and buoyancy will benefit from this discussion.

ankit1
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1. When a heaveir body having density more than water, is submerged in water, as per Newton's third law of motion, it experiences an equal & opposite thrust i.e. an upward thrust equal to its weight. Then, the body should have remained afloat, but, we find it sinks. Is it not violative of Newton's 3rd law?
Further, we cannot move a car/bus by our push while sitting/standing inside. But, we can make them move by push from outside.Why?




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Go back and look at the chapter of the Newton's third law. You should note the point the force vector acting and the answer is obvious.
 

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