A basic question from screw jack coefficient of friction

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The discussion centers on the negative coefficient of friction observed in the lowering state of a screw jack with two pulleys. Participants seek clarification on the mechanics involved and the specific arrangement of the jack and pulleys. A request for a diagram indicates a need for visual representation to better understand the system. The conversation highlights the complexities of friction in mechanical systems, particularly in the context of screw jacks. Overall, the inquiry emphasizes the importance of clear explanations and visual aids in understanding mechanical principles.
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why the coefficient of friction of screw jack of two pulley is negative in lowering state?
 
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haseeb661 said:
why the coefficient of friction of screw jack of two pulley is negative in lowering state?
Can you explain the question better? I don't understand the arrangement of jack and pulleys. Can you give us a diagram?

AM
 

Thread 'Mousetrap Car Energy efficiency'

For simple comparison, I think the same thought process can be followed as a block slides down a hill, - for block down hill, simple starting PE of mgh to final max KE 0.5mv^2 - comparing PE1 to max KE2 would result in finding the work friction did through the process. efficiency is just 100*KE2/PE1. If a mousetrap car travels along a flat surface, a starting PE of 0.5 k th^2 can be measured and maximum velocity of the car can also be measured. If energy efficiency is defined by...
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