Does a stick of dynamite contain force?

No.  Force isn't something you can enclose in a box, an envelope,
or a bottle.

A stick of dynamite contains some amount of a chemical compound which,
when triggered by enough heat or shock, undergoes a chemical reaction
that proceeds very rapidly, and generates a large quantity of gases before
the gases can dissipate.  This creates very high pressure around the reaction,
and it's this pressure in a small volume that exerts great force for a very short
time.     The whole process is often described as an "explosion".