Understanding Torque: The Role of Axis of Rotation in Force Calculation"

[oneplusone]

Hello,

[1]-Why is it that if you have a force acting upon an object at the point of the axis of torque,
you don't account it in the equation when solving for torque?

Sorry, not really sure how to word it, but ill give it another shot:

You have a long piece of wood on the ground, with many forces acting upon it. On one side of
the wood, you choose the axis of rotation. One of the forces acts on this point at a 42 degree angle.

When calculating the net torque on the object, why do you disregard that force which acts on the point?

Thanks. and let me know if i should try to reword.

 

[SteamKing]

Not making the connection. Perhaps a picture would help.

 

[PhanthomJay]

Torque is calculated about a chosen point on an axis. When the force acts through that point, there is no perpendicular distance from the force to the point.

 

[oneplusone]

Thanks, got it now!

 

[PJC01]

Hello, thank you for your question. In order to understand why the force acting on the axis of rotation is not included in the torque equation, we first need to understand what torque is. Torque is a measure of the force that can cause an object to rotate around an axis. It is calculated by multiplying the force applied to an object by the distance from the axis of rotation to the point where the force is applied. This means that the farther away the force is from the axis of rotation, the greater the torque will be.

Now, to answer your question, the force acting on the axis of rotation does not contribute to the torque because it does not create any rotation. Since the distance from the axis of rotation to the point where the force is applied is zero, the torque will also be zero. In other words, the force is acting directly on the axis of rotation, so it cannot create any rotation. Therefore, it is not included in the torque equation.

I hope this helps to clarify your understanding of torque and its relationship to the axis of rotation. Keep exploring and asking questions, and you will continue to deepen your understanding of this important concept in physics. Best of luck in your studies!