What are forces?

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Across
  1. 2. Objects stay in motion unless acted on by an ______ force
  2. 4. Motion will not change when ______ forces act on an object
  3. 7. When things move, we can say they are in ______
  4. 8. A pull or a ______ are common forces
Down
  1. 1. The unit for measuring forces
  2. 3. The tendency for objects to stay in motion
  3. 5. Force ______ are used in diagrams to demonstrate forces
  4. 6. Gravity is a downward ______