Unbalanced and Balanced forces

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Across
  1. 3. what pulls us to the earth's core
  2. 5. the straight path an object moves along
  3. 6. type of force where two forces are acting in the opposite direction and aren't equal
  4. 9. a type of force with physical contact involved
  5. 10. a balanced force occurs when an object is still or ______
Down
  1. 1. the object's rate of change of the position
  2. 2. the resistance that one surface or object encounters when moving over another.
  3. 4. the push or pull of an object
  4. 7. type of force where two forces are acting in the opposite direction and are
  5. 8. a type of force where there is no physical contact involved