Which device allows for easier horizontal movement of heavy objects?

The device that allows for easier horizontal movement of heavy objects is the air casters. Air casters work by suspending an object on a cushion of air, which significantly reduces friction between the object and the surface it is being moved across. This unique mechanism enables heavy loads to be maneuvered with comparatively little effort, making it ideal for moving large equipment or material across flat surfaces.

In contrast, while a pallet jack can lift and move loads, it is primarily suited for handling palletized goods over shorter distances and may not be as effective for heavier loads over a wider area. A forklift is primarily designed for lifting and transporting loads vertically and is more suited for moving items in warehouse settings or on construction sites rather than specifically for horizontal movement. A hoist is typically utilized to lift and lower objects rather than for horizontal transport. Therefore, air casters stand out as the most efficient device for the horizontal movement of heavy objects.