任意の Collider2D がエフェクターと接触した際、その直線運動を遅くする力を加えます。
直線の抗力には、エフェクターと接触する Collider2D を遅くする能力があります。直線の抗力を増大させると、コライダーの移動がさらに難しくなる粘性流体をシミュレートできます。
これは ::Rigidbody2D::drag に似ていますが、抗力は速度の関数として適用されているだけではなく、Collider2D の水没している領域も考慮されており、より複雑です。抗力は水没しているエリアの中心に適用され、それによってトルクを発生させることができます。つまり、オブジェクトが回転します。
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