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 thrustThrust 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

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