In fig shows a block and tackle system of pulleys used to lift a load .

(a) How many strands of tackle are supporting the load ?

(b) Draw arrows to represent tension T in each strand.

(c) What is the mechanical advantage of the system ?

(d) When load is pulled up by a distance 1 m, how far does the effort end move ?

(e) How much effort is needed to lift a load of 100 N ?

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Solution

(a)There are 4 strands of tackle supporting the load
(b)

(c)
$M A equals fraction numerator L o a d space over denominator E f f o r t end fraction equals fraction numerator 4 T over denominator T end fraction equals 4$

(d)
when load is pulled by a distance 1m, the effort end will move by 4*1=4 m

(e)

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The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end move?

The given figure shows a block and tackle system of pulleys used to lift a load. When the load pulled up by a distance 1m, how much do the effort end move?

In fig. draw a tackle to lift the load by applying the force in the downward direction.

(a) Mark in the diagram the direction of load L and effort E.

(b) If the load is raised by 1 m, through what distance will the effort move ?

(d) What is the mechanical advantage of the system ?

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(a)There are 4 strands of tackle supporting the load (b) (c) (d) when load is pulled by a distance 1m, the effort end will move by 4*1=4 m (e)