You saw a situation where the hand was pulled down by a single force, the tension in the shopping bag. It is quite possible...
Early introductions to forces in equilibrium will be via static situations. However, rather than identifying forces which sum...
The forks can hang off the side because all the forces are balanced
The bottom coil of the slinky remains stationary until the top coils reach it and then the whole slinky drops to the floor...
Recognising and celebrating outstanding contributions to the field of physics education.