When we walk on sand we leave our foot prints in the sand. This is due to the weight of our body which acts normal to the surface of contact – the foot and sand. Similarly when we want to stick a picture in a scrap book we apply a force normal to the surface of the paper. Such force acting normally on a surface is called thrust. Thus, the net force acting normal to a surface is called thrust. Thrust is a vector quantity.
Definition of thrust
Thrust – Total force acting perpendicular to the surface.
Unit of thrust
Si unit of thrust : newton (N)
C.G.S unit of thrust : dyne
Thrust is also expressed in kgwt or gwt or kgf.
1 kgwt = 9.8 N
1 gwt = 980 dynes