Final answer:
The best tool for removing a broken asphalt strip shingle is a shingle remover, which provides efficiency and minimal damage to the roof.
Step-by-step explanation:
The best tool to use for removing a broken asphalt strip shingle is a shingle remover. This specialized tool is designed for the task and can help lift and remove shingles with minimal damage to the underlying roofing material. A shingle remover, often also referred to as a roofing shovel or a shingle ripper, has a notched blade that fits under the edges of shingles, allowing for an easier tear-off.
A flat pry bar can also be effective, especially for lifting up the edges of shingles and for removing nails, but it may not be as efficient as a shingle remover for larger jobs. While a roofing knife is a useful tool for cutting shingles, it is less helpful for removal, and a flat shovel may cause more damage to the roofing surface and should be used with caution.