Machines vocabulary

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Across
  1. 2. The speed of something getting faster.
  2. 4. Something moving by a force
  3. 6. Half of the diameter
  4. 7. How much matter is in a specific volume.
Down
  1. 1. How strong something is being pulled or pushed
  2. 3. Multiple objects rubbing against each other.
  3. 5. How an object inside of an object moves