Are you unable to lift an object which property makes the object difficult to lift

As an AI, I don't have a physical form or the ability to interact with objects, so I don't have the capability to lift anything. However, I can help explain the factors that can make an object difficult to lift.

When it comes to lifting objects, there are several properties that can make them difficult to lift:

1. Weight: The most obvious factor is the weight of the object. The heavier an object is, the more effort it requires to lift.

2. Size and Shape: Objects with irregular shapes or uneven weight distribution can be challenging to lift because they can be awkward to handle or may require special lifting techniques.

3. Friction: Objects with rough or sticky surfaces can create more resistance against lifting due to the increased friction between the object and the lifting surface.

4. Center of Gravity: An object with a high center of gravity or one that is too far away from the lifter's center of gravity can make it more difficult to maintain balance while lifting.

5. Stability: Objects that are unstable or unbalanced, such as those with shifting contents, can be tricky to lift without the risk of tipping or spilling.

In summary, the weight, size, shape, friction, center of gravity, and stability of an object can all contribute to making it difficult to lift.