Point P at point C is not considered in force and moment calculations because it is a point of zero distance, also known as a singularity. This means that the equations used to calculate forces and moments would result in an infinite value, which is not physically meaningful.
Point C is the point of intersection between the line of action of a force and the moment arm. It is used as a reference point for calculating the moment arm and determining the direction of the moment.
Yes, point C can be moved as long as it is kept on the line of action of the force. This will not affect the magnitude of the force or the moment, but it may change the direction of the moment.
Point C is usually given in the problem statement or can be determined by visualizing the problem and identifying the point of intersection between the line of action of the force and the moment arm. Alternatively, it can also be calculated using trigonometric equations.
No, point C is not always necessary. In some cases, the force and the moment arm may be given, and point C may not be explicitly mentioned. However, it is important to understand the concept of point C and its role in force and moment calculations.
