Lab no 1A
First and Last Name: Igor Petek
Measuring length with caliper
Class: 1.L
Group: B
________________________________________
Date:
Grade:
_______________
EQUIPMENT:
caliper, glass or metal tube or rod
OBJECTIVE:
- determine the width of a given body and calculate maximum absolute and maximum relative
error of your measurements
EXPERIMENTAL METHOD AND PROCEDURE:
- First, we divided into groups of 3, we gathered the necessary equipment, the caliper and the
metal tube. The width of a given body was measured using a caliper.
-
RESULTS AND DISCUSSION OF RESULTS:
Number of
measurements
1.
2.
3.
4.
5.
6.
a/cm
(length)
2
2.01
2.03
2
1.99
2
a =2.005
a
0.005
-0.005
-0.025
0.005
0.015
0.005
am=-0.025
a1  a2  ...  an
= (2+2.01+2.03+2+1.99+2)/6=2.005cm
n
a = a - ai= 2.005'2=0.005cm
am=-0.025cm
a = ( a  am )n=(2.0050.025)cm
a m
rm =
100()=1.25%
a
a=
rm=1.25%
CONCLUSIONS:
The maximum absolute(am) and maximum relative(rm) error was calculated. The width of the
body is (2.0050.025)cm. The maximum absolute error is 0.025cm and the maximum relative error
is 1.25%.