Related Experiment Video
Updated: Jun 3, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
Published on: August 30, 2016
Position measurements obeying momentum conservation
1Mathematical Physics Section, Department of Mathematics, University of York, York, United Kingdom. paul.busch@york.ac.uk
Abstract:
We present a hitherto unknown fundamental limitation to a basic measurement: that of the position of a quantum object when the total momentum of the object and apparatus is conserved. This result extends the famous Wigner-Araki-Yanase theorem, and shows that accurate position measurements are only practically feasible if there is a large momentum uncertainty in the apparatus.
Related Concept Videos
Conservation of Momentum: Introduction
Conservation of Momentum: Problem Solving
Principle of Linear Impulse and Momentum for a System of Particles
Notably, internal forces between particles, occurring in equal and opposite collinear pairs, cancel out and are not part of the equation of motion. This exclusion simplifies the...
Conservation of Linear Momentum for a System of Particles
The impulsive force at play during this interaction is of extremely short duration, rendering its impulse negligible. When...
Principle of Linear Impulse and Momentum for a Single Particle
Delving into...
Collisions in Multiple Dimensions: Introduction

