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In case of forces, a couple means
  • a)
    Two unequal forces acting at two points
  • b)
    Two equal and like parallel forces acting at two points
  • c)
    Two equal and perpendicular forces acting at two points
  • d)
    Two equal and opposite forces acting at two points
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
In case of forces, a couple meansa)Two unequal forces acting at two po...
Couple: When the pair of equal parallel forces that are opposite in direction applied on a body then it rotates of tries to rotate about a point or axis is called a couple. ​

Moment of a couple or couple (C) = P × a
Characteristics of a couple: A couple (whether clockwise or anticlockwise) has the following characteristics: 
  • The algebraic sum of the forces, constituting the couple, is zero. 
  • The algebraic sum of the moments of the forces, constituting the couple, about any point is the same, and equal to the moment of the couple itself.
  • A couple cannot be balanced by a single force. But it can be balanced only by a couple of opposite sense. 
  • Any no. of co-planer couples can be reduced to a single couple, whose magnitude will be equal to the algebraic sum of the moments of all the couples.
Torque (τ): It is a physical quantity, similar to force that causes the rotational motion. It is the cross product of the force with the perpendicular distance between the axis of rotation and the point of application of the force with the force.
⇒ τ = r × F = r F sin θ
Where r = distance from point of application of force (in meter), f = force (in Newton), and θ = angle between 
Also, Torque (τ) = r × f = r ×  F
Where r = component of the distance in the direction perpendicular to the 
F = component of the force in the direction perpendicular to 
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In case of forces, a couple meansa)Two unequal forces acting at two pointsb)Two equal and like parallel forces acting at two pointsc)Two equal and perpendicular forces acting at two pointsd)Two equal and opposite forces acting at two pointsCorrect answer is option 'D'. Can you explain this answer?
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