Rigidbody (Player) goes through wall

Questions & Answers
1

I have a game that player is the cube.That cube moves around.The cube has a rigidbody with box collier.When the player moves toward the wall, and touch the wall, a bit later, the player suddenly goes through. How to prevent a rigidbody to move through walls?
#pragma strict

    // Move object using accelerometer
    var speed = 10;
     
     
     
    function Start () {
    Screen.sleepTimeout = SleepTimeout.NeverSleep;
     
     
    }
     
     
     
     
    function Update () {
     
     
     
    var dir : Vector3 = Vector3.zero;
     
     
     
    dir.x =/*Input.acceleration.x*5;*/ Input.GetAxis("Horizontal");//Input.acceleration.x*5;//Input.GetAxis("Horizontal");//-Input.acceleration.y;
     
    dir.z =/*Input.acceleration.y*2;*/Input.GetAxis("Vertical");//Input.acceleration.y*5;//Input.GetAxis("Vertical"); //Input.acceleration.x;
     
    // clamp acceleration vector to unit sphere
    if (dir.sqrMagnitude > 1)
    dir.Normalize();
     
    // Make it move 10 meters per second instead of 10 meters per frame...
    dir *= Time.deltaTime;
     
    // stop to cross movement
     
    if(Mathf.Abs(dir.x) > Mathf.Abs(dir.z)) {
    dir.z = 0;
    }
    else {
    dir.x = 0;
    }
     
    // Move object
    transform.Translate (dir * speed);
    }
2

Use this instead of transform.Translate();

public float walkAcceleration = 5f;
rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * Time.deltaTime, 0, Input.GetAxis("Vertical") * walkAcceleration * Time.deltaTime);