Error analysis and uncertainty

Jun 17th, 2015
Studypool Tutor
Price: \$10 USD

Tutor description

In making physical measurements, one need to keep in mind those measurements is not completely accurate. Each measurement will have some number of significant figures and should also have some indication as to how much we can “trust” it (i.e. error bars).

Word Count: 4538
Showing Page: 1/13
Error analysis and uncertaintyIn making physical measurements, one need to keep in mind those measurements is not completely accurate. Each measurement will have some number of significant figures and should also have some indication as to how much we can trust it (i.e. error bars). Thus in order to reliably interpret experimental data, we need to have some idea as to the nature of the errors associated with the measurements.A systematic error is when measurements are incorrect in some consistent fashion.The consistency of the erroris the key point. There has to be a system to what has gone wrong.This is the opposite of a random error.Systematic errors are caused by some consistent fault. This is going to be either - a fault with the apparatus - a faulty technique (but one that is consistently applied)Apparatus faultsA common fault with certain apparatus is a zero error, where the instrument does not measure zero correctly.E.g. a newton meter spring has slipped a little, so that the meter reads 0.3N before any force is applied. Every reading that you take with this newton meter will be 0.3N too large.A similar fault might be if the spring in the newton meter had started to weaken with age. If the spring was (for example) twice as easy to stretch as it should be, every force reading would be twice the true value. Technique faultsIf you consistently do the wrong thing, this may cause a systematic error.E.g.

Review from student

Studypool Student
" Awesome! Exactly what I wanted. "

1825 tutors are online

Other Documents

06/17/2015
06/17/2015

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors