Final answer:
The force used to explain the higher boiling point of HF compared to HBr is hydrogen bonding.
Step-by-step explanation:
The force used to explain why the boiling point of HF is greater than the boiling point of HBr is hydrogen bonding. HF is capable of forming hydrogen bonding within its compounds, which is a strong dipole-dipole interaction. This interaction results from the electrostatic attraction between the partially positive hydrogen atom in one molecule and the partially negative fluorine atom in another molecule.