弾力
だんりょく · danryoku · JLPT N1 · noun
elasticity
🏀 弾 (bounce) + 力 (force) = bounce force, i.e. elasticity
弾む (hazumu) means to bounce, and 弾力 is the force that makes things spring back. The 弾 here is the bouncing sense, not the bullet sense.
力 — pictograph of a plow or arm muscle
力 originated as a pictograph of an ancient plow, the main tool requiring physical exertion in early agriculture. Some scholars also see it as a flexed arm showing muscle. From this concrete image it broadened to mean 'strength, power, force, effort'.