Thrust


 
 
Concept Explanation
 

Thrust

Thrust: The net force acting normal to a surface is called thrust. Thus, a body kept in any orientation exert equal thrust on the surface. It is the net force, so its S.I. unit is newton (N) . It is also expressed in kilogramme weight (kg wt)

1 kg wt = 9.8 N

For example :

The pressure of the book depends on the area over which the force is distributed. Pressure may be measured in any unit of force divided by any unit of area. The standard international (SI) unit of pressure is newton per square metre called the pascal (Pa).

Huge pressure is measured in kilopascal (1 kPa = 1000 Pa).

Characteristics of thrust :

  • For the same volume inside the fluid more the density of fluid, greater is the thrust.
  • Larger the volume of the body submerged in the fluid, greater is the thrust.
  • The upthrust acts on the body in upward direction at the centre of buoyancy i.e. the center of gravity of displaced liquid.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Which of the following are correct :

    (a) For the same volume inside the fluid more the density of fluid, smaller is the thrust.

    (b) For the same volume inside the fluid more the density of fluid, greater is the thrust.

    (c) Larger the volume of the body submerged in the fluid, greater is the thrust.

    Right Option : C
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    Explanation
    Question : 2

    Which of the following are correct :

    (a) The net force acting normal to a surface is called thrust.

    (b) The SI unit of pressure is newton per square metre called the pascal (Pa).

    (c) S.I. unit of thrust is newton (N).

    Right Option : D
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    Explanation
    Question : 3

    What is the SI unit of thrust ?

    Right Option : A
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    Explanation
     
     


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