Physics crossword

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Across
  1. 5. quantity that designates how fast and in what direction a point is moving
  2. 6. When two forces are the same strength but act in opposite direction
  3. 7. the resistance that one surface or object encounters when moving over another.
Down
  1. 1. the force applied in one direction is greater than the force applied in the opposite direction
  2. 2. science that deals with the structure of matter and the interactions between the fundamental constituents of the observable universe
  3. 3. the sum of all the forces acting on an object
  4. 4. a vehicle's capacity to gain speed within a short time