Question

When calculating the mechanical advantage of a lever, what two pieces of information are needed?

A. the mass of the object being moved and the length of the effort arm
B. the length of the effort arm and the length of the resistance arm
C. the length of the resistance arm and the amount of effort needed to move the object
D. the length of the resistance arm and the amount of resistance force that is exerted

Answer 1

From the items on this list, the only one that allows calculation
of the mechanical advantage is 'B' ... the lengths from the fulcrum
to the effort and the resistance.

The MA can also be calculated when you know the two forces ...
the effort and the resistance ... when the lever is just balanced.

Answer 2

Option B)

the length of the effort arm and the length of the resistance arm

Step-by-step explanation:

A lever is a simple machine with a point fulcrum known also as a hinge. The lever helps to rotate the body and vary the input force and output force to get maximum mechanical advantage.

Mechanical advantage of a lever is the ratio of the output force to input force.

When there is no friction or other forces this mechanical advantage can also be calculated as the ratio of length of effort arm to length of resistance arm.

Hence option B is right.