Question

It has come to my attention that for some spurious reason I can both observe where my daughter is and apparently not be confused over her velocity at a given moment. Estimate the uncertainty in her position as I might observe it, and, given this, estimate the uncertainty in her speed. Why is this sort of uncertainty not a concern, say, when you do experiments in General Physics and analyze them based on Newtonian Physics?

Answer 1

Let her uncertainity in position be , Let her uncertainity in velocity is , let her mass be m = 30kg

from uncertainty principle

  

putting values we get get = 1.8 x 10-31 m/s   which very negligible for a macroscopic body

this principle works for both newtonian and quantum mechnaics but, i loses its relevance in netwtonian mechannics as such low value of uncertainity does not affect the motion or the other phenomenon for Newtonian physics