Balanced and Unbalanced

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Across
  1. 3. force Two equal objects acting in opposite directions.
  2. 5. A tendency to stop, or to stay still.
  3. 6. Measurement of an object's speed and direction.
  4. 7. force Two unequal forces acting in opposite directions.
  5. 9. Rate of change of position, distance, in a period of time.
Down
  1. 1. The weight of an object.
  2. 2. Rate of change in an object's velocity.
  3. 4. A push or a pull on an object.
  4. 8. A straight path an object can move along on.