Percent error and vectors

  • Thread starter un_cooled
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  • #1

Homework Statement

What will happen to the percent error of graphical or force table method as the number of vectors to be added increases? Give proof.

3 vectors
A = 400 g
B = 450 g
C = 427 g

Homework Equations

The Attempt at a Solution

First, I computed for the percent error of 2 vectors. I used vectors A & B:

% error = [(400 - 425)/425] x 100 = 5.88%

Then, I computed for the percent error of 3 vectors:

% error = [(400 - 425.67)/425.67] x100 = 6.03%

I concluded that as the number of vectors to be added increases, the percent error also increases. I'm not really sure about my answer.

Answers and Replies

  • #2
Science Advisor
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I am not sure what you are doing, you seemed to have taken an average of two or three numbers and then compared the first with the average? This is not correct. The percent error is the
((experimental value determined from the graph or force table - theoretical value determined from calculations)/theoretical value)) times 100 , or,

% error = 100(Experimental - Theoretical)/Theoretical.

The theoretical value is always the same. What about the experimental value as you increase the number of vectors in a given experiment?