player.rs

pub fn ship_movement(
    time: Res<Time>,
    player_input: Res<PlayerInputRes>,
    mut query: Query<(&Ship, &mut Physics, &mut RigidBodyHandleComponent), With<Player>>,
    mut rigid_body_set: ResMut<RigidBodySet>,
) {
    for (ship, mut physics, rigid_body_handle) in query.iter_mut() {
        if let Some(rigid_body) = rigid_body_set.get_mut(rigid_body_handle.handle()) {
            let delta = time.delta_seconds();

            physics.velocity += player_input.input_vector * ship.thrust * delta;
            physics.velocity = physics.velocity * physics.friction;

            let mut pos = *rigid_body.position();
            pos.translation.vector += physics.velocity;
            rigid_body.set_next_kinematic_position(pos);
        }
    }