The Arc of a Bolo: 2D Motion in the War Reenactment

When a Prop Takes Flight: Horizontal and Vertical Motion Together

One of the most dramatic moments in the Cry of Jelicuon reenactment involves performers throwing prop weapons (bolos, rifles) in choreographed arcs. What the audience sees as a single graceful curve is actually two completely separate motions happening at the same time: a horizontal (sideways) motion and a vertical (up-and-down) motion. The trick of physics is that we can study each motion on its own and then combine them to predict the whole path.

In two-dimensional projectile motion, the horizontal part of the motion moves at constant velocity (assuming no air resistance) — it never speeds up or slows down sideways. Meanwhile, the vertical part accelerates downward at g = 9.8 m/s² because gravity is always pulling it toward the ground. These two parts are independent: changing one does not affect the other. That is why a prop can keep drifting sideways at a steady rate even while it falls faster and faster.

Performers jumping from risers also demonstrate this principle. The jump's launch angle decides how the effort is split between horizontal distance (called the range) and maximum height. A steep, high angle sends the performer mostly upward but not very far forward; a shallow, flat angle sends them forward but they drop to the floor quickly. A 45° angle strikes the perfect balance and gives the maximum range on level ground — useful for choreographing dramatic leaps across the stage.

Riser Jumps and Independent Motion Components

When a performer leaps from the top of an elevated riser during the Cry of Jelicuon, their body simultaneously undergoes two independent motions: horizontal displacement driven by their launch momentum, and vertical free-fall driven by gravity. At the peak of the jump, vertical velocity reaches zero for a brief instant — but horizontal velocity remains unchanged. This separation of components is why performers can cover significant horizontal distance while still clearing the stage floor safely. The choreographer exploits this physics deliberately: timing the jump so horizontal travel lands the performer at a precise formation mark.