Force acting on an object perpendicular to surface is called thrust


It is net force acting in a particular direction

It is always perpendicular to surface on which force applied


When we stand on loose sand,our body is exerting force on sand by our feet

Surface of Sand is horizontal but our feet is standing vertically on it

It can be seen that our feet are applying force perpendicular to surface area

This force is called thrust

Feet on sand.png

Example 2

When we fix a poster to bulletin board

We fix a pin to it

It can be seen that bulletin board is vertically placed

we apply force in perpendicular direction by pressing pin to it

This force is called thrust

Nail is perpendicular to surface.png

What is formula of thrust?

Since thrust is also a force

Its formula is same as force

Thrust = Mass × Acceleration = m × a = m × g 

Since it is a force,its SI Unit is also Newtons


Force = Mass × Acceleration

F = m × a

Acceleration due to gravity is denoted by g,So formula becomes

F = m × g

Since thrust is also a force,we can also write that

Thrust = f = m × g

  1. Class 9
  2. Chapter 10 Class 9 - Gravitation

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 9 years and a teacher from the past 16 years. He teaches Spoken English, Written English, Grammar and Vocabulary at Englishtan.