Simple Machines Crossword Puzzle

123456
Across
  1. 2. a simple machine made up of a bar that pivots at a fixed point called a fulcrum
  2. 5. a tool that makes work easier
Down
  1. 1. a flat, sloping surface
  2. 3. made of 2 inclined planes, back to back
  3. 4. made up of 2 wheels of different sizes, one inside the other
  4. 5. an inclined plane wrapped around a cylinder to form a spiral
  5. 6. a grooved wheel with a rope wrapped around it