Question

Define the moment of force about an axis or a point. When is it taken as positive. please please answer my question ​

Answer 1

Explanation:

If the rotation of point B about O is considered, then the angular acceleration about that point O ,

Ω ~ (Fsinθ)r

=> kΩ = (Fsinθ)r

Where (Fsinθ)r = τ

Where τ is the torque of F about 0

Now τ = (Fsinθ)r = kΩ

τ j = kΩj

Which implies if you increase torque about j then Ω increases in the same direction.

Conventionally,

If 180° > θ > 0° then body rotates anticlockwise (see fig) and otherwise it rotates clockwise. Employing signs to anticlockwise direction as positive axis and clock wise direction as negative axis,

τ j = kΩj = r × F

Answer 2

Answer:

movement of force can be define as the product of the magnitude of applied froce and shortest distance between axis of rotation and line of action of force. It is positive when the force applied on the objects tends to rotate it in anticlock wise direction

Explanation:

hope it helps you...