Why do objects fall at the same speed in free fall?

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Discussion Overview

The discussion revolves around the concept of free fall and the effects of gravity on objects of different masses. Participants explore why objects, such as a feather and a hammer, fall at the same speed in a vacuum, while also questioning the implications of mass on gravitational attraction between objects and the Earth.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification
  • Mathematical reasoning

Main Points Raised

  • Some participants assert that gravity acts between all objects with mass, leading to questions about why heavier objects do not pull the Earth closer to them during free fall.
  • One participant suggests that the equal fall of objects is an approximation valid for objects with negligible mass compared to the gravity source.
  • Another participant emphasizes the need to clarify that the statement "all objects fall at the same speed" is only true under specific conditions, such as negligible atmospheric drag.
  • Some argue that the acceleration due to gravity is independent of the mass of the falling objects, while others point out that the time to impact can differ if the masses are comparable.
  • There are discussions about the importance of context and the frame of reference when considering gravitational effects and free fall.
  • Participants mention that scientific laws can have limitations and depend on specific conditions, which should be communicated clearly to avoid misconceptions.

Areas of Agreement / Disagreement

Participants express differing views on the validity of the statement "all objects fall at the same speed in free fall." While some agree that it is a simplification, others highlight the need for careful explanation of its limitations. The discussion remains unresolved regarding the implications of mass on gravitational interactions during free fall.

Contextual Notes

Participants note that the discussion involves assumptions about the mass of objects and the effects of gravity, which may not hold in all scenarios. The relevance of atmospheric conditions and the frame of reference are also highlighted as important factors in understanding the dynamics of free fall.

  • #31
mfb said:
It depends on the sum. arel=G(M+m)/R2.
Oops, yes you are right. The reduced mass gives the equivalent force for a 1 body problem.
 

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