sentences: majority colliding half the kinetic matter
docs: inelastic_collision is colliding. one_half is common_fraction. colliding is irreflexive_action. tumbling is partial_rotation. colliding is barrier_situation_physical_force. colliding is pressing. rifling is rotation_non_periodic. first_half is half. rifling_nonconstrained is projectile_motion. rifling_nonconstrained is rifling.