This is a topic that may have been chosen for personal interest and may look to be unimportant but has the potential to explore some interesting aspects of change. For example, have the changes in hockey sticks been for the better or worse? (With the new composite sticks, players can shoot the puck harder but the stick costs a lot more and the cost of equipment is a problem for many Canadians.)
The topic could also consider cause and consequence:
What led to changes in the sticks – player innovation, technology, rule changes?
How have changes in equipment changed the way the game is played?