Question

station 4
simple machines
which example of levers would require the least amount of force to move the box?
e. lever a
f. lever b
g. lever c
h. they are all first - class levers which require the same amount of force.

Explanation:

Step1: Recall lever - force relationship

The mechanical advantage of a first - class lever is given by $MA=\frac{d_{effort}}{d_{load}}$, where $d_{effort}$ is the distance from the effort force to the fulcrum and $d_{load}$ is the distance from the load to the fulcrum. The effort force $F_{effort}=\frac{F_{load}}{MA}$. For a given load force $F_{load}$, a larger mechanical advantage requires a smaller effort force.

Step2: Analyze the levers

In a first - class lever, the fulcrum is between the effort and the load. Looking at the levers A, B, and C, the lever with the largest distance from the effort force to the fulcrum (longest effort arm) relative to the distance from the load to the fulcrum (load arm) will have the largest mechanical advantage. Lever C has the longest effort arm compared to the load arm among the three levers.

Answer:

G. Lever C