Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 2. A doorstop is one of these simple machines 4. A ramp that has one end higher than the other 6. A rod or bar that can help lift a weight 7. One of seven machines that make up all complex machines

Down: 1. Bars that go through the center of many wheels 2. Round object that turns and helps move heavy loads 3. cone shaped simple machine with a groove that winds round and round in a spiral 5. Two kinds of special wheels that move around a fulcrum to help lift things