Make physics more fun

backend/src/physics/functions/force-at-position.ts

@@ -0,0 +1,9 @@
+import { vec2 } from 'gl-matrix';
+import { Physical } from '../physicals/physical';
+
+export const forceAtPosition = (position: vec2, objects: Array<Physical>) =>
+  objects.reduce(
+    (sum: vec2, o: Physical) =>
+      !o.canMove ? vec2.add(sum, sum, o.getForce(position)) : sum,
+    vec2.create(),
+  );