Tension

pull back, let go. twelve arrows, twelve targets.

archery on a summer range: draw a longbow, feel the joules go into the bend, and score twelve targets that get further, higher, windier and start to swing

A bow is a spring: the energy in the bend grows as the square of how far you draw it, so twice the draw stores four times the joules, and this light wooden bow hands the arrow about half of them. That energy is all it has: it spends it climbing, gets some back falling, and gives a few percent to the air. In a headwind a high slow lob loses the most, so a flatter, harder draw pays more at the start and keeps it.

Concepts: energy, elasticity.

An interactive you play with one thumb, on Wundr.