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Answer

torque is moment of a force=force*perpendicular distance between there line of action

Answer

Torque is a force that tends to cause rotation.

Answer

Torque: It is force required to rotate a object around an axis,fulcrum or pivot.It is just like force which is used to push or pull objects,but here it just rotates or twists the object when applied.Thus it can be said as turning force or twisting force.it is denoted by τ

The torque due to force F that acts on a particle at position r is defined to be τ = r × F.

|τ| = |r⊥| |F| |τ| = |r| |F⊥|.

direction of torque is decided by right hand cross product rule 

Answer
Torque is the measure of force that is required to rotate an object
Answer

Torque is the twisting force that tends to cause rotation. The point where the object rotates is known as the axis of rotation. Mathematically, torque can be written as T = F * r * sin(theta), and it has units of Newton-meters.  

Answer

Torque is a measure of how much a force acting on an object causes that object to rotate. The object rotates about an axis, which we will call the pivot point, and will label 'O'. We will call the force 'F'. The distance from the pivot point to the point where the force acts is called the moment arm, and is denoted by 'r'. Note that this distance, 'r', is also a vector, and points from the axis of rotation to the point where the force acts.

Answer

 Torque or moment of force   is required for turning effect on a body about a fixed axis.
example : to open  a door

Torque is equal to the product of the magnitude of the force and the perpendicular distance of the line of action of force from the axis of rotation

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