State the relationship between mechanical advantage ,velocity ratio and efficincy
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consider a simple machine lifting a load L through a distance dl by applying an effort E to it through distance de.
Then, according to the definition of efficiency,
Efficiency= output work/input work × 100·/·
= work done by load/work done by effort ×100·/·
=load ×distance moved by load/effort×distance moved
by effort ×100·/·
= MA×1/VR ×100·/·
Efficiency = MA/VR×100·/·
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