Converting Potential Energy to Kinetic: Analyzing Resistant Forces

AI Thread Summary
The discussion focuses on the conversion of potential energy (GPE) to kinetic energy (KE) using the equation mgh = 1/2 mv^2, where the mass cancels out if weight remains constant. The main challenge highlighted is calculating resistant forces such as air resistance and friction in the wire and pulley system. Participants seek guidance on how to incorporate these resistant forces into their energy balance calculations. It is noted that while the ideal scenario assumes no losses, using a well-designed pulley system can minimize friction and wind resistance. Understanding these factors is crucial for accurately determining the final speed at the bottom of the system.
daddylange
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the way i see it is this is a simple potential to to kinetic balance.

mgh = 1/2 mv^2

the m's cancel assuming the weight isn't changing.

so here's the hard part.

calculating the resistant forces.

air resistance and friction in the wire/pulley

so can anyone get me started on how to calculate those energies and put it into my first balance?
 
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GPE = maximum KE at bottom.

So, mgh at top = 0.5mv2 at the bottom. So you can work out the final speed.

Of course, that assumes no losses. But if you have a good bearing on the harness pulley the friction losses would be incredibly small from that and wind resistance.
 

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