Question

A door is pushed at a point whose distance from the hinger is 90 cm, with a force of 40N calculate the moment of the force about the hinges ​

Answer 1

The moment of the force about the hinges ​is 36 N-m.

Explanation:

1. Magnitude of force (F) = 40 N

  Distance of point of application from hinge (R) = 90 cm = 0.9 m

  Moment (M) = unknown

2. We know that

   Moment = Force × perpendicular distance

   M = F × R      ...1)

   Here Perpendicular distance means that shortest distance between line of action of force and point of rotation.

3. From equation 1)

   Moment (M) = 40 ×0.9 = 36 N-m

   

Answer 2

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