Mr. Burkholder's Physical science 9

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Across
  1. 3. the rate at which someone or something is able to move or operate.
  2. 4. the degree of compactness of a substance.
  3. 6. downward movement under the force of gravity only.
  4. 9. a quantity having direction as well as magnitude, especially as determining the position of one point in space relative to another.
  5. 10. a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
  6. 11. a quantity that has both magnitude and direction
  7. 13. the speed of something in a given direction.
  8. 14. the resistance that one surface or object encounters when moving over another.
  9. 15. resistance is a force that is caused by air. The force acts in the opposite direction to an object moving through the air.
  10. 16. rength or energy as an attribute of physical action or movement.
  11. 18. is the vector sum of forces acting on a particle or body.
Down
  1. 1. large body of matter with no definite shape.
  2. 2. the SI unit of force
  3. 5. A force that completely balances the weight of an object at rest.
  4. 7. an object or system of objects in mechanical equilibrium, the sum of forces equals zero.
  5. 8. increase in the rate or speed of something.
  6. 12. the base unit of mass in the International System of Units
  7. 17. hold down by placing a heavy object on top of it.