diff --git a/src/actor.rs b/src/actor.rs
index 2cce813..eb61f48 100644
--- a/src/actor.rs
+++ b/src/actor.rs
@@ -126,9 +126,12 @@ pub fn update_physics_actors(
     time: Res<Time>,
     mut q_actors: Query<(&mut Actor, &mut Transform)>,
 ) {
+    let d = time.delta_seconds();
     for (actor, mut transform) in q_actors.iter_mut() {
         transform.rotate(actor.angular_momentum);
-        transform.translation += actor.v;
+        // TODO: animate only a step based on time between update:
+        //transform.rotate(actor.angular_momentum.slerp(Quat::IDENTITY, d)); // not working
+        transform.translation += d * actor.v;
     }
 }