Can 1 dmg be roughly estimated in Joules? [closed]

Related to this question: How many Joules does strength values ten through twenty estimate to?.

The same players are curious if the amount of force required to do 1 dmg can be roughly estimated in Joules?

Physics issues:

  • The primary worlds of D&D (Greyhawk, Forgotten Realms, and Dragonlance) have been established as having Earth-similar physics as the default when not overridden by psionics, magic, incarnum, etc..
  • All tests are taking place at sea level and in a gravity normal area (1 atmosphere, and 1G).
  • no special effects are interfering, allowing for normal physics to operate and be measured.
  • average humans are being used to conduct this experiment.
  • no beings were harmed in the process of these experiments.
  • Materials from the hardness / breaking tables are being used as targets, and are of a size and weight to exactly match the values listed on the table.

Though experiment issues:

  • Using the strength values given in the previous question, the Joules of STR bonus could be roughly estimate, however explosive striking force (from a punch or kick) is likely a different value from lifting a weight overhead force.
  • Effects like Control Fire give values of damage for different sizes of fire, and comparing the size of fire with the amount of damage it will do to various objects on the hardness/breaking tables which might serve as a possible yardstick to estimate.
  • HP is a universalized generalization which almost certainly does not equate to real world values of health and/or structural damage capacity of flesh or rock etc, for example, and average first level commoner might have an hp of 2, and a small pebble has 2 hp, but the amount of force required to deal "1 hp" of damage might not be equivalent.

It might not be possible to come up with an estimate value for 1 dmg due to the possibly inconsistent values of hp between different materials, however, please give it a go. Feel free to make whatever assumptions or estimates are necessary to come up with a rough estimate.

Why is flash power given in watt-seconds (Ws) and not joules (J)?

Flash manufactures often (always) specify the power in watt-seconds (Ws), and not in the SI unit joules (J). See and example for the Godox studie flash QT series.

Since the unit conversion says that W = J / s, so Ws = (J / s) * s = J, thus the unit J could just as well have been used.

Is there any good reason that flash power is given in watt-seconds (Ws) and not joules (J) ?