Hydraulics: Push Force vs Gravity Force?

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Discussion Overview

The discussion revolves around the mechanics of hydraulics, specifically comparing the forces exerted by a hydraulic system when pushing a mass away from the ground versus pushing it towards the ground. The scope includes conceptual understanding and technical reasoning related to forces and gravity in hydraulic applications.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions whether the force applied by a hydraulic system is the same when pushing a mass away from the ground as when pushing it towards the ground, suggesting that gravity may assist in the latter case.
  • Another participant agrees that gravity assists when pushing downwards but notes that for larger loads, the effect of gravity is insignificant compared to the force exerted by the hydraulic ram.
  • A further contribution indicates that for smaller loads, gravity's influence becomes more noticeable, particularly in the context of friction when lifting.

Areas of Agreement / Disagreement

Participants generally agree that gravity plays a role in the forces involved, but there are differing views on the significance of this effect depending on the load size. The discussion remains unresolved regarding the extent of gravity's influence in different scenarios.

Contextual Notes

Some assumptions about load sizes and the specific conditions under which gravity's influence is considered may not be fully articulated, leading to potential ambiguity in the discussion.

nb89
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Just have a question about how hydraulics work...
When a hydraulic pushes a mass away from the ground, does it apply the same force as to when it pushes the same mass towards the ground? I'm wondering if gravity assists it when its pushing it towards the ground and therefore can apply a lower force. Is this right?
 
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Of course.
 
Gravity assists, of course, but for 'reasonable' loads it is insignificant compared to the force of the ram. If you're driving a 50kg pole into the ground with a 100 tonne ram, gravity really doesn't enter into the picture. On the other hand, a 1kg ram in the same situation would be much less noticeable in comparison to gravity.
 
grAVITYH WILL cause friction here its only affects on the case of lifting
 

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