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The force that acts on an object perpendicular to its surface is the thrust  measured in newton(N) . Thrust it a force that is sent out from an object through its own propulsion. 

eg : A jet engine creates thrust and pushes an  airplane along. 

The effect of thrust per unit area is called pressure. Pressure is a force that is put on an object. Unit is Pascal (Pa). 

 pressure = thrust / area

eg : When a submarine dive the water pushes in on it.