Torque - Practice Questions & MCQ

• Vector product of Force vector and position vector is known as torque.

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•  Its direction is always perpendicular to the plane containing vector  r and F and with the help of right hand screw rule we can find it.

• The magnitude of torque is calculated by using either 

= perpendicular distance from origin to the line of force.

= component of force perpendicular to line joining force.

Where is the angle between vector  r and F

•  If a pivoted, hinged  body tends to rotate due to an applied force, then it is said  that torque is acted on body by force.

Example-

In the  rotation of a hinged door when we apply torque with the help of  force F.

• SI Unit- Newton-metre

• Dimension-

•  If a body is acted upon by more than one force, then we get  the resultant torque by doing vector sum of each torque.

•  Just like  force is the  cause of translatory motion similarly Torque is the cause of rotatory motion.