Question

2. Define the momen
une the moment of force about an axis or a point. When is it taken as positive​

Answer 1

Answer:

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:

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

Explanation: