Simple Machines

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Across
  1. 2. This can be a push or a pull on an object. Machines work by changing the amount of this needed to do something.
  2. 3. Simple machines are devices with few or no moving parts that make it easier for us to do ______.
  3. 4. The _______ plane is a flat surface with one end higher than the other, allowing heavy objects to slide up to a higher point rather than be lifted.
  4. 6. This simple machine consists of a round disk, known as a _____, with a rod through the centre of it, known as the axle.
  5. 7. This simple machine changes a gentle turning force into a strong forward force. It is made up of an inclined plane wrapped in a spiral around a pole.
Down
  1. 1. A ______ is a bar or board that rests on a support called a fulcrum. A downward force on one end can be transferred and increased in an upward direction at the other end, allowing a small force to lift a heavy weight.
  2. 3. Which simple machine consists of two inclined planes which meet to form a sharp edge and can split things apart, or hold things still.
  3. 5. What type of simple machine uses a wheel with a groove in it for a rope, and makes it easier to lift things?
  4. 7. How many basic types of simple machines are there?