You can try:
Go to Sheet1
Select all cells (using the square button just above the "1" for Row 1, and just to the left of the "A" for Column A)
Go to Edit, Copy from the menus
Go to Sheet2
Select Edit, Paste Special, All
That's one way.
Also, you could create formulas in Sheet2 that look like this:
Which would copy the value in A1 on Sheet1 (but not any formatting) to Sheet2, and change when the value in Sheet1 changes.