Move a Part at Constant Speed Under its Own Weight

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SUMMARY

The discussion centers on designing a wire apparatus that allows a hanging weight to descend at a constant speed of 1 m/s under its own weight. The key challenge is to achieve a balance of forces that accommodates varying weights while maintaining this terminal velocity. The proposed solution involves utilizing a variation of a flyball governor, where weights with brake pad material contact a surrounding cylinder to apply braking force as the descent speed increases. Commercially available devices, such as those from Torqhoist, can facilitate this mechanism.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with concepts of terminal velocity
  • Knowledge of friction and drag forces
  • Basic principles of mechanical governors
NEXT STEPS
  • Research the design and functionality of flyball governors
  • Explore the physics of terminal velocity in varying mediums
  • Investigate commercially available braking systems for weight control
  • Learn about the dynamics of friction in mechanical systems
USEFUL FOR

Mechanical engineers, physics students, and hobbyists interested in designing weight-controlled descent systems or studying the dynamics of motion under gravity.

omalleyt
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How can I make a hanging weight attached to a wire move at a constant speed under its own weight? The mass of the weight may vary and is not known beforehand.
 
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Move where? What are the constraints on control? You haven't provided enough details for us to know what you are trying to do and what the constraints are.
 
My guess is to assume a frictionless environment. The question then becomes what is the shape of the curve that provides constant speed under the influence of gravity. The answer is a horizontal line, essentially eliminating any influence from gravity.

If friction or aerodyanmic drag is allowed, than any straight line path will result in some terminal velocity, but initially the object will be accelerating.
 
It is a little ambiguous what exactly is being asked. Constant velocity implies no net force, so your question makes me think about terminal velocity which is established through air resistance, or some sort of friction between the wire and something else. Alternatively, perhaps a counter weight of identical mass on the other side of a pulley is what your getting at.
 
Ok. Sorry, you guys are right my first question was really vague. Here's a better description of what I'm trying to achieve. I want to design a wire apparatus that lowers a weight using the mass of the weight as the force, but then somehow achieves a balance of forces when the velocity reaches 1 m/s. This is simple enough using friction (I think), but the problem is that different weights will be put on this apparatus under different conditions, and the terminal velocity for each has to be 1 m/s.
 
How about a variation of a flyball governor, wherein the flying weights have brake pad material on the leading edges and contact a surrounding cylinder? The faster it tries to fall, the more braking force is applied.
 

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