Toppling giving example of a block on horizontal surface?

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Discussion Overview

The discussion revolves around the concept of toppling, specifically using the example of a block on a horizontal surface. Participants explore the role of friction and the relationship between the center of gravity and the block's stability.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant asks for clarification on toppling and its relation to friction and center of gravity.
  • Another participant suggests that if the center of mass is not above the contact area, the block will begin to topple, regardless of friction.
  • A participant questions how the center of mass can be below the contact point, noting that the contact point is the lowest point on the surface.
  • A clarification is provided that the center of gravity can be to the side of the contact area, which can lead to rotation due to torque from gravity.

Areas of Agreement / Disagreement

Participants express uncertainty about the initial question and the mechanics of toppling, indicating that multiple interpretations and understandings exist regarding the conditions under which a block may topple.

Contextual Notes

There are unresolved aspects regarding the definitions of center of mass and center of gravity, as well as the conditions necessary for toppling to occur.

Shahid0072
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Please explain me the toppling giving example of a block on horizontal surface? Is friction necessary? What's its deal with center of gravity?
 
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I'm not completely sure I understood the question completely, but here goes:

If the centre of mass of the block is not above the contact area between the block and the table, it will start to move (fall over completely if there is nothing else that stops it). This happens whether there is friction or not.

Torquil
 


But how can center of mass ever be below contact point..I mean contact point is at lowest point on the surface..When does a block topple?
 


Ah, I meant that either the centre of gravity is "above the contact area", or to the side of it. Not under it :-) If it is to the side of the area of contact, then you can prove that it starts to rotate to the side by considering the torque of gravity upon the object, with respect to some appropriately chosen axis.

TOrquil
 

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