Ballistic.cs

using UnityEngine;

public class Ballistic : MonoBehaviour
{
	public Vector3 velocity;

	void Update ()
	{
		velocity += Physics.gravity * Time.deltaTime;

		transform.position += velocity * Time.deltaTime;
	}
}

This is useful in lieu of a Rigidbody to move stuff around.

Do NOT use this if you have a Rigidbody already on your item, unless it is set to IsKinematic.

This obviously does not know anything about collisions.

You can replace the Physics.gravity term with a function of your liking, such as one to always accelerate towards a particular point in space.