Dwarves are not small in the first place anyway. Small races are below 1,20m tall. Dwarves are around 1,30-1,50m tall. They are short, but not small.
In comparison, humans are only 10-30cm taller on average with their 1,60-1,80m heights.

They may appear smaller because they are stockier and wider. So unless you see them next to a human, you won’t realize they are only about a head or so sorter.

Discworld dwarves are something else.

That would not work. Pushing an object is transmitting kinetic energy to it. The object will push back, and energy would not be distributed to the whole object at the same time.
If the object cannot be altered in any way, then the energy would not be transferred to it, and if it has enough plasticity to absorb the kinetic energy, it would be spread in a wave to the tip. A wave that would always be slower than light.

Now stop fooling around and give Ruyi Jingu Bang back to Sun Wukong.

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