Making it simple

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Across
  1. 2. The invention of the spinning ____________ made it easier to spin cotton.
  2. 5. A lever is a bar that lifts or moves a load by applying ____________ at one point.
  3. 7. A complex machine is made up of __________ simple machines.
  4. 8. What are the spiral grooves and ridges On a Screw called _____________.
  5. 9. An axe and chisel is an example of a ____________.
Down
  1. 1. A _____________ is used in Crane to lift heavy objects.
  2. 3. A complex machine that has a Pulley and inclined plane
  3. 4. Any tool that help us reduce the effort to perform a task is called a ____________.
  4. 6. A simple tool used to open cans is called a ___________ .