放ほう物ぶつ運うん動どう

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Meanings

1

noun

parabolic motion

Physics term for the motion of an object following a parabolic trajectory under uniform gravity, neglecting air resistance.

放set free, release, fire

物thing, object, matter

運carry, luck, destiny

動move, motion, change

放ほう物ぶつ線せん
放物線 is the parabola itself, while 放物運動 refers to the motion along that curve.
投とう射しゃ運うん動どう
投射運動 is a broader term for projectile motion, which may include non-parabolic paths; 放物運動 specifically implies a parabolic trajectory.

Compound of 放物 (parabola) and 運動 (motion). The exact historical derivation is uncertain, but the term is a standard modern physics coinage.