What investigations never involve hypotheses?

Descriptive investigations

Explanation:

The descriptive investigations is a process which involves the collection of the qualitative and quantitative data based upon the research question, observations are made, it involves no comparison and no variables are manually changed or manipulated.

These kind of investigations does not involve formulation of hypothesis or making pre-research prediction.  

the force on the thing and the distance the force moves the thing

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table