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EQUILIBRIUM, WHEN A STATE OF REST IS MAINTAINED BY THE OBJECT, WHEN A…

- - - - Clockwise torques are balanced by the counter-clockwise torques.
        
        EXAMPLES
      - The symbol ∑ is a Greek letter called sigma used for summation.
- - - - EXAMPLES
        
        • A book lying on a table.
        
        • A picture hanging on a wall, are at rest and thus satisfies the first condition for equilibrium.
        
        • A paratrooper coming down with the terminal velocity also satisfies the first condition for equilibrium and is thus in equilibrium.
    - - ∑ Fx =0
        ∑ Fy=0