How to find objects with specific tags and make those objects fall ?

Scripting
1 
private int selectSimulation = -1;

public int SelectedSimulation() { return selectSimulation; }

// Update is called once per frame
	void Update () {
		
		if ( Input.GetMouseButtonDown( 0 ) )
		{
			int shape = GetComponent<GUIScript>().SelectedShape();			
			int simulation = GetComponent<GUIScript>().SelectedSimulation();

			switch ( shape )
				{
					// Cube
					case 0:
					if(!GetComponent<GUIScript>().returnChooseShape() )
					{
						CubeCount ++;
						GameObject cube = GameObject.CreatePrimitive( PrimitiveType.Cube );
						cube.name = "Cube" + CubeCount;
						cube.tag = "Cube";
						Rigidbody cubeRigid = cube.AddComponent<Rigidbody>();
						cubeRigid.useGravity = false;
						cubeRigid.mass = 10;
						cube.transform.localPosition = objPos ;
						GetComponent<GUIScript>().resetShape();
						//tempCubeCount = CubeCount;
						print( camera.transform.localPosition );
					}
					break;

					...
				}

			if( simulation != -1 )
			{
				switch ( simulation )
				{
					// play
					case 0:
					for(int i =0; i <= CubeCount; i++)
					{
						i = tempCubeCount;
						GameObject.Find ("Cube"+i).gameObject.rigidbody.useGravity = true;
					}
						//var Cubes = GameObject.FindWithTag("Cube");
					
						//GameObject.FindWithTag("Cube").gameObject.rigidbody.useGravity = true;
						// GameObject.FindWithTag
						// for(
						// gameObject.rigidbody.useGravity = true;
						
						break;
					
					// pause
					case 1:
						break;
					
					// reset
					case 2:
						break;
				}
			}
}

Above are parts of my codes … I would like to know how to find objects of a specific tag and how to make the objects fall … Can anyone kindly explain to me ? :confused:

2

Please use the code tags to format your code, it will make it easier to read and get help.

Using code tags

3

Thankyou for the tips, Landern !