You wish to lift a 400 lb car engine a vertical distance of 3 ft using a strong rope. Unfortunately, your hand crank winch can only generate 100 lb of tension in your rope. In order to overcome this obstacle, you use a multiple pulley system (block and tackle) to lift the engine.

What is the mechanical advantage of this system?

Question

25 March, 11:16

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Jared Payne · Answer 1

Mechanical Advantage = Outputforce / inputForce

outputforce = 400 X 3 = 1200

Mechanical Advantage = 1200 / 100

MA = 12