The diagram indicates the least force $F_1$ acting vertically on a lever that is needed to raise a heavy log of weight $W$. The log must be lifted using a force smaller than $F_1$. The diagrams illustrate the changes that were tested. Each diagram differs from the original only by one alteration. In every case, $F_2$ is the least force needed to lift the log. In which situations will $F_2$ be less than $F_1$?
- AP, Q and R
- BP and Q only
- CP only
- DQ and R only