Question

The block and tackle pulley system acts as a force multiplier. There is no gain in energy in this case’. Do you agree with this statement? Prove your answer

Answer 1

Answer:

The movable pulley reduces the effort required to pull a mass by factor of 2 × number of movable pulleys. Consider a simple example of single fixed and movable pulley.

In case I of fixed pulley the effort will be same as of load being lifted as tension in rope will be same across pulley, hence mechanical advantage will be 1.

F

effort

=F

load

In case II of movable pulley the effort will be half of that load being lifted as the forces on mass less pulley should balance, mechanical advantage will be 2.

2F

effort

=F

load

⇒F

effort

=F

load

/2

Movable pulley is used as force multiplier

Explanation:

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