6(ii)
Three levers X, Y, Z of equal lengths are shown in the diagram.
(a) Which class of lever do these belong to?
(b) Among these (X, Y or Z) which one will give the maximum mechanical advantage? Justify your answer.
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(a) All are class I levers since, the fulcrum is in between the load and effort.
(b) As,
$\text {Mechanical Advantage} = \frac{\text {Effort Arm}}{\text {Load Arm}}$
For X, effort arm is greater than the load arm. Hence, it has the maximum mechanical advantage.