Physics Simulator

public static class PhysicsSimulator {
        /// <summary>
        /// Add force to velocity
        /// </summary>
        public static Vector3 AddForce(this Vector3 velocity, Vector3 force, float mass, ForceMode forceMode = ForceMode.Force) {
            switch(forceMode) {
                case ForceMode.Force:
                    velocity += (force / mass) * Time.fixedDeltaTime; break;
                case ForceMode.Acceleration:
                    velocity += force * Time.fixedDeltaTime; break;
                case ForceMode.Impulse:
                    velocity += force / mass; break;
                case ForceMode.VelocityChange:
                    velocity += force; break;
            }

            return velocity;
        }

        /// <summary>
        /// Get just the force without adding it to velocity
        /// </summary>
        public static Vector3 GetForce(this Vector3 force, float mass, ForceMode forceMode = ForceMode.Force) {
            switch(forceMode) {
                case ForceMode.Force:
                    return (force / mass) * Time.fixedDeltaTime;
                case ForceMode.Acceleration:
                    return force * Time.fixedDeltaTime;
                case ForceMode.Impulse:
                    return force / mass;
                case ForceMode.VelocityChange:
                    return force;
            }

            return Vector3.zero;
        }

        /// <summary>
        /// Moves a position based on acceleration and drag
        /// </summary>
        public static Vector3 SimulatePosition(this Vector3 position, Vector3 velocity, Vector3 acceleration, float drag = 0) {
            velocity += acceleration * Time.deltaTime;
            velocity -= velocity * drag * Time.deltaTime;

            return position + velocity * Time.deltaTime;
        }

        /// <summary>
        /// Applies acceleration and drag to the velocity
        /// </summary>
        public static Vector3 SimulateVelocity(this Vector3 velocity, Vector3 acceleration, float drag = 0) {
            velocity += acceleration * Time.deltaTime;
            velocity -= velocity * drag * Time.deltaTime;

            return velocity;
        }
    }