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  • Force can be a push or pull. 
  • Force has magnitude as well as direction. 
  • Force acting on an object may cause a change in its state of motion or a change in shape.
  • Thrust is the total force acting perpendicular on a surface tending to compress it. Thrust is expressed in Newton.
  • The thrust/ unit area is pressure and is expressed in pascal. 
  • The pressure in a liquid increases with depth.
  • The pressure in a liquid is same at all points at a given depth.
  • Liquids seek their own level.
  • Air has weight
  • Air exerts pressure
  • Air occupies space

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