Friction and gravity

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Across
  1. 1. When two forces are acting in opposite directions on an object, and are different sizes.
  2. 5. The force that 2 surfaces exert on each other when they rub against each other.
  3. 6. The force that pulls objects towards each other.
  4. 7. When a solid object moves through a fluid.
  5. 8. When two forces are acting in opposite directions on an object, and are of equal sizes.
  6. 11. The force of gravity on a person or an object at the surface of a planet.
  7. 12. When 2 solid surfaces slide over each other.
Down
  1. 2. An upward force exerted on falling objects.
  2. 3. The friction that acts on objects not moving.
  3. 4. When an object rolls across a surface.
  4. 9. When the only force acting on an object is gravity.
  5. 10. The amount of matter that is in an object.