Unity physics Help Implementing Real Life Physics in Jumping System C#

What up people, i'm a 14 year old turning 15 this year just wanting to see if there's any way to do this thing I wanna do. So I'm learning some basics about C# code, and I tried making a jumping system, using C# scripting. Collision features have been working wonders It's been going amazing so far, I've solved a lot of my own problems and am moving along.

However, I want to implement real life jumping, you know how you can't change your direction in mid air but when you run and jump your left over friction moves you. Anyway, the problem I'm having is that my cube gameobject can move while still rising or going down. Want to make it so my left over friction from moving will impact movement in the air & Moving System is disabled in the air.

 Script that moves the Cube:

 using UnityEngine;
 using System.Collections;
 
 public class Move : MonoBehaviour
 {
 
 
     public GameObject Cube;
 
     //floats here:
  
 
     public float MoveSpeed = 5.0f;
     public float RotationSpeed = 5.0f;
     Vector3 Vick = Vector3.forward + Vector3.right;
     Vector3 Vicky = Vector3.right + -Vector3.forward;
     Vector3 Vickyy = -Vector3.forward + Vector3.left;
     Vector3 Vickyyy = Vector3.left + Vector3.forward;
     Vector3 Rod = Vector3.down + Vector3.right;
     Vector3 Rods = Vector3.up;
     Quaternion Quad = Quaternion.identity;

 
     // Use this for initialization
       
     //Start of my updates.
     void FixedUpdate()
     {
 
         Rigidbody Cube = GetComponent<Rigidbody>();
 
 
 
         //Translation aka Moving right left up down whatever
         if (Input.GetKey(KeyCode.UpArrow) && !Input.GetKey(KeyCode.RightArrow) && !Input.GetKey(KeyCode.LeftArrow) && !Input.GetKey(KeyCode.DownArrow))
         {
             transform.Translate(Vector3.forward * MoveSpeed * Time.deltaTime);
         }
 
         else if (Input.GetKey(KeyCode.DownArrow) && !Input.GetKey(KeyCode.RightArrow) && !Input.GetKey(KeyCode.LeftArrow) && !Input.GetKey(KeyCode.UpArrow))
         {
 
             transform.Translate(-Vector3.forward * MoveSpeed * Time.deltaTime);
         }
         else if (Input.GetKey(KeyCode.LeftArrow) && !Input.GetKey(KeyCode.RightArrow) && !Input.GetKey(KeyCode.UpArrow) && !Input.GetKey(KeyCode.DownArrow))
         {
             transform.Translate(Vector3.left * MoveSpeed * Time.deltaTime);
 
         }
 
 
         else if (Input.GetKey(KeyCode.RightArrow) && !Input.GetKey(KeyCode.LeftArrow) && !Input.GetKey(KeyCode.DownArrow) && !Input.GetKey(KeyCode.UpArrow))
         {
             transform.Translate(Vector3.right * MoveSpeed * Time.deltaTime);
         }
 
 
 
 
         //Diagonal movement lol
         if (Input.GetKey(KeyCode.UpArrow) && Input.GetKey(KeyCode.RightArrow))
         {
             transform.Translate(Vick * MoveSpeed * Time.deltaTime);
         }
 
         else if (Input.GetKey(KeyCode.DownArrow) && Input.GetKey(KeyCode.RightArrow))
         {
             transform.Translate(Vicky * MoveSpeed * Time.deltaTime);
         }
 
 
         if (Input.GetKey(KeyCode.DownArrow) && Input.GetKey(KeyCode.LeftArrow))
         {
             transform.Translate(Vickyy * MoveSpeed * Time.deltaTime);
         }
 
 
         else if (Input.GetKey(KeyCode.LeftArrow) && Input.GetKey(KeyCode.UpArrow))
         {
             transform.Translate(Vickyyy * MoveSpeed * Time.deltaTime);
         }
         else if (Input.GetKey(KeyCode.RightArrow) && Input.GetKey(KeyCode.DownArrow))
         {
             transform.Translate(Rod * MoveSpeed * Time.deltaTime);
         }
 
 
 
 
         //Rotation!
         else if (Input.GetKey(KeyCode.RightControl) || Input.GetKey(KeyCode.LeftControl) && Input.GetKey(KeyCode.
             RightArrow))
             transform.Rotate(Vector3.up * RotationSpeed * Time.deltaTime);
         else if (Input.GetKey(KeyCode.LeftControl) || Input.GetKey(KeyCode.RightControl) && Input.GetKey(KeyCode.LeftArrow))
             transform.Rotate(-Vector3.up * RotationSpeed * Time.deltaTime);
 
 
 
 
 
         // Color functionsyeah
 
         if (Input.GetKeyDown(KeyCode.R))
         {
             GetComponent<Renderer>().material.color = Color.red;
         }
         if (Input.GetKeyDown(KeyCode.G))
         {
             GetComponent<Renderer>().material.color = Color.green;
         }
         if (Input.GetKeyDown(KeyCode.B))
         {
             GetComponent<Renderer>().material.color = Color.blue;
         }
         if (Input.GetKeyDown(KeyCode.Y))
         {
             GetComponent<Renderer>().material.color = Color.yellow;
         }
 
         if (Input.GetKeyDown(KeyCode.C))
 
         {
             GetComponent<Renderer>().material.color = Color.cyan;
         }
         if (Input.GetKeyDown(KeyCode.C) && Input.GetKeyDown(KeyCode.Space)) 
         {
             GetComponent<Renderer>().material.color = Color.clear;
             print("Cleared");
 
         }
 
         GetComponent<Rigidbody>();
      
       
 
 
 
 
 
 
         
 
     }
        
 
 
 
      }
 
 
 Script that makes it jump, (two separate scripts)
 
 using UnityEngine;
 using System.Collections;
 
 public class cor : MonoBehaviour
 {
     public float jump = 5.0f;
     public GameObject Amy;
     Vector3 Rods = Vector3.up;
 
 
 
 
 
 
 
 
 
     void OnCollisionEnter(Collision col)
     {
         if (col.collider.tag == "Floor")
         {
             gameObject.transform.rotation = new Quaternion(0f, 0f, 0f, 0f);
 
         }
     }
 
 
 
     void OnCollisionStay(Collision col)
     {
         
         Rigidbody Amy = GetComponent<Rigidbody>();
         if (col.collider.tag == "Floor")
             if (Input.GetKey(KeyCode.Space) && !Input.GetKeyDown(KeyCode.C))
             {
                 Amy.AddForce(Rods * jump, ForceMode.Acceleration);
                 print("finaLLY");
             }
 
 
     }
     void OnCollisionExit(Collision col)
     {
         if (col.collider.tag == "Floor")
         {
             gameObject.transform.rotation = new Quaternion(0f, 0f, 0f, 0f);
 
         }
     }
 
 }

Thank you I know this was hard to solve for me, but for you genius people at unity it's prob easy :D. Thanks so much. -Joshua.