Question

How is dr. Hewitt able to break a piece of wood in his demonstration?

Answer 1

Answer:

Dr Hewitt is able to break the piece of wood in his demonstration given that he had knowledge about the concept of momentum, which is esentially  the product of the mass and speed of an object.  

Aplying this idea, he used the correct momentum of his hand over a short period of time and that is how he was able to break the piece of wood.