Which of the following tools would be less suitable for heavy lifting?

The tool identified as less suitable for heavy lifting is specifically designed for tasks that require gripping and manipulating smaller objects rather than moving or lifting heavy loads. Pliers are primarily used for gripping, twisting, bending, and cutting wires or metal; they provide precision and control rather than the mechanical advantage necessary for heavy lifting.

In contrast, the other tools mentioned have characteristics that make them more effective for lifting heavy objects. A crowbar is a lever tool that can be used to pry apart objects and leverage heavy items through manual effort. A lever, in general, is a fundamental simple machine that allows a person to lift a heavier load with less effort by using a fulcrum. A hydraulic jack utilizes hydraulic pressure to lift heavy loads with minimal input force, making it specifically engineered for heavy lifting tasks.

Understanding the specific functions and mechanisms of these tools helps clarify why pliers are not suitable for heavy lifting compared to the other options.