Continuous mouvement with physics

Unity Engine
1

Hi there,
While scripting how can we know if and object is moving or not ?
the solution I found is that to see the difference between positions cheked at the Update function and the FixedUpdate function, the problem is that I dont want my object to stop moving (its moving due to an AddForce function) ! (it actually can stop cauz its an object gliding on a collider with Ice material and there is a slope sometimes), and according to that I apply a harder Addforce for it to move when detecting the difference but its not slerp
Here is my c# script

[Cheking the difference between positions inside the update function is the same]

using UnityEngine;
using System;
using System.Collections;

public class mvtScript : MonoBehaviour {

	public bool isGrounded = false;
	public float advanceForce = 35F;
	public float fallForce = -30F;
	public float density = 1.5F;
	public Vector3 rotPoz;
	public float vitesseX;
	public float point;
 
	void Awake() 
    {
		point = transform.position.x;
    }

void Update()
{
       if(point > transform.position.x)
	{
	Vector3 temp = transform.position; 
	temp.x=point;
	transform.position=temp; // ensure that the GO wont go back
	this.rigidbody.AddForce(200,0,0);
	}
	point=transform.position.x;
}
	void FixedUpdate ()
	{
		
		if (Input.GetKey("down"))
		{
			this.rigidbody.AddForce(0, fallForce, 0);
		}
		if(isGrounded)
		{
			this.rigidbody.AddForce(advanceForce,0,0);
			fallForce=-1F; 
		}
		if(!isGrounded)
				fallForce=-90F;
	}
}

And as I said, this gives me non slerp mouvement, and its not what I exactly need ! Any suggestions ?

2

For my question :

and here is the best solution I encounterd

if(rigidbody.velocity.sqrMagnitude < .01  rigidbody.angularVelocity.sqrMagnitude < .01)

remains me to find a way to make the mouvement as much slerp as possible