Function perpendicular_force_component 

pub fn perpendicular_force_component(
    force: f64,
    angle_radians: f64,
) -> Option<f64>

Computes the component of a force that acts perpendicular to a lever arm.

Formula: F_perp = F * sin(theta)

Returns None when either input is not finite or when the computed result is not finite. Negative forces are allowed.