PPT Slide
Forces involve two objects and
should always be labeled this way
What are the SI units of force? Newtons (N) = kg m/s2
Some practicalities of forces
Force is a vector and must be treated like one
(e.g. when summing etc.).
But, like in kinematics, forces acting in
independent directions can treated independently
If you can’t clearly label a force A->B
you probably aren’t dealing with a
force even if it seems like it should be