Question

A 10 N force is applied at a distance of 1 m from the hinge of door such that the line of action of force is parallel to the plane of the door. The moment of force produced on the door is :

• A. $10Nm$
• B. $100Nm$
• C. $1Nm$
• D. $0Nm$

Answer 1

Answer: (D)

$0Nm$

Moment of force = Force applied Perpendicular distance from the fixed axis.
Since the line of action of force is parallel to the plane of the door, in this case the vector product of two parallel forces will be zero.