🚀 go-pugleaf

In my AP physics class for the last four years I have been dutifully
assigning problems from the text we use (Physics, Giancoli 3rd edition) for
my students to solve.  I have also been getting increasingly dissatisfied
with this.  The problems usually key in on a particular section of a chapter
with its narrow focus of possible concepts to be brought to bear on the
problem and their equation(s).  I don't disparage this.  I do, however, wish
there was more.
For example, I came across an interesting problem not too long ago which
simply asked the following: "If two galaxies passed through each other, what
is the probability that two stars would collide?  Or one Neils Bohr once
proposed, "How many molecules does a car tire lose for each revolution of the
tire.   To solve the problem there are estimates that have to be made and
relevant quantities researched.  There  is a strategy to solving the problem
that is not tacitly dictated by the section of the text the problem comes
from.  And so on.
Anyhoo, I am not terribly creative at making up my own such problems like
this.  I also have not found any good sources as yet.  If you know of any
such source, or have pet problems like this you wouldn't mind sharing, could
you pass it along to me?
Thank you

Mike Macallister
Central Catholic High School
Portland, Oregon