A set point where all measurements can be taken from
It is important to use a fixed common reference point on your work peace or drawing to avoid cumulative error, i.e. if a hole is drilled using an incorrect measurement initially, then continuation to measure from the error instead of using a common reference point could result in a whole piece of work being scrapped. Also if somebody has to take over the work, they would need to understand were the dimensions were taken from to enable them to carry on with the work.
A couple is a mechanical term defined as a system of forces that produces a resultant moment but not a resultant force. The moment caused by a couple is different than the moment caused by a single force. The moment of a force is dependent upon a reference point (i.e. if this reference point changes the moment also changes), therefore it is a fixed (or bound) vector. However, the moment (or torque) of a couple is independent of a reference point. In other words any reference point will give the same torque. This fact is proven in Varignon's Second Moment Thereom. Since the moment (or torque) of a couple is independent of a reference point, it may be represented as a free vector. This means that the vector may be freely moved in space.
A lever can rotate around the fixed point that is called a pivot. Levers are used to reduce the force need to do a particular task.
Turndown: The allowable operating range for the centrifugal compressor between the design point and the surge line at any given speed for a fixed compressor head.
Single fixed pulley
What is the fixed reference point in the photos?
Without a fixed Point of Reference, there is nothing to be relative to.
reference point
It is because many things are measured with reference to a fixed point: it space or time. This point is called a reference point or origin.
A frame of reference in physics, may refer to a coordinate system or set of axes
There do not appear to be ANY "fixed points" in the Universe. Everything is in motion, and there is no "preferred" frame of reference.
Reference point
It is the process of a change in position relative to some fixed point of reference.
motion
No because enable to see if the object is moving it needs a reference point other than itself.
It is because all measurements are taken from that point: it is the fixed point of reference.
It is a fixed reference point whose elevation above a given datum line