Upload
chacha-atienza
View
225
Download
0
Embed Size (px)
Citation preview
8/6/2019 Expt1 - For Oral Report
1/22
Experiment 1
8/6/2019 Expt1 - For Oral Report
2/22
2005-12-31
Course NameMore Description About the Course
Your NameYour Title
1st Line ofYourOrganization2nd Line ofYour
Organization
Certain devices are used to obtain accurate
measurements of an object. During the course of
the experiment, three measuring devices wereused to accurately measure the dimensions of the
given object. Each measuring device can measure
from a scale of centimeter to millimeter
accurately up to two decimal places.
Summary of the Experiment
8/6/2019 Expt1 - For Oral Report
3/22
3
Introduction
The instruments used are:
vernier caliper
micrometer caliper
foot rule
Each are used to obtain
precisely accurate
measurements.
8/6/2019 Expt1 - For Oral Report
4/22
2005-12-31
Course NameMore Description About the Course
Your NameYour Title
1st Line ofYourOrganization2nd Line ofYour
Organization
Objectives
To study errors and how they propagate in a simple experiment
To determine the average deviation of a set of experimental
values obtained
To determine the mean of a set of experimental values as wellas set of average deviation of the mean
To familiarize the students with the vernier calliper, micrometer
calliper and foot rule
To compare the accuracy of the measuring devices used
To compare the accuracy of the measuring devices used
To Determine the density of an object given its mass and
dimensions.
8/6/2019 Expt1 - For Oral Report
5/22
Theory
Average Deviation
Mean Deviation
Mean Diameter
Volume
Density
% Error Density
a.d.= d
n
A D =d
n
d= re ding me n di meter
V=4
3 r
3
D=m
V
%E o =D
EVD
AV
DAV
100
8/6/2019 Expt1 - For Oral Report
6/22
6
Methodology
The experiment was conducted with the giveninstruments mainly the vernier caliper,
micrometer caliper and the foot rule.
T
he metal balls given to each group measuredits diameter.
The objective was to find out what measuring
device is more accurate by getting the % error
of each measurement.
8/6/2019 Expt1 - For Oral Report
7/22
7
Vernier Caliper
1. Inside jaws
2. Retaineror locking screw3. Vernier scale (inch)
4. Rail (inch)
5. Depth probe
Front end of the rail
Main scale (mm)Vernier scale (mm)
Sliding Jaw
Outside jaws
Fixed Jaw
8/6/2019 Expt1 - For Oral Report
8/22
8
Micrometer Caliper & Foot Rule
8/6/2019 Expt1 - For Oral Report
9/22
9
Results & Discussion
Acitivity 1 Diameter of Sphere (cm)Trial Foot Rule Vernier Caliper Micrometer
Caliper
1 1.5 1.580 1.579
2 1.5 1.775 1.5763 1.5 1.570 1.575
4 1.5 1.550 1.580
5 1.5 1.770 1.574
6 1.5 1.565 1.5857 1.5 1.585 1.584
8 1.5 1.580 1.579
9 1.5 1.575 1.578
10 1.5 1.585 1.580
8/6/2019 Expt1 - For Oral Report
10/22
10
Results & Discussion
Acitivity 1 Diameter of Sphere (cm)
Foot Rule Vernier Caliper Micrometer Caliper
Mean Diameter 1.5 1.574 1.579
(a. d.) 1.5 1.574 1.579
(A. D.) 0.474 0.498 0.499
Volume 1.767 cm 2.042 cm 2.061 cm
Mass 16.28 g 16.28 g 16.28 g
Experimental
Value of density
9.213 g/cm 7.973 g/cm 7.899 g/cm
Accepted Value of
Density
7.86 g/cm 7.86 g/cm 7.86 g/cm
% Error for Density 17.21 % 1.24% 0.50%
8/6/2019 Expt1 - For Oral Report
11/22
11
Results & Discussion
Activity 2
Group
Member
1 2 3 4 5
Width of
Thumb (in)
0.64 0.82 0.60 0.62 0.66
8/6/2019 Expt1 - For Oral Report
12/22
12
Results & Discussion
The possibilities of having a % error in the
experiment are the accuracy of the used
instruments. In the said data the foot rule isthe least accurate while the micrometer
caliper deems to be the more efficient tool
in measuring the metal ball.
8/6/2019 Expt1 - For Oral Report
13/22
13
Conclusion
The group concluded that it is more efficient to
use measuring devices that can measure
objects up to 0.01mm.T
he reason is that theless % error we obtain the more we are near to
its true value.
8/6/2019 Expt1 - For Oral Report
14/22
14
Applications
1) Which among the three measuring devicesgive you the least % error? Is the accuracy of a
measurement affected by the least count of the
measuring devices?
The group concluded that it is more efficient to
use measuring devices that can measure
objects up to 0.01mm. The reason is that theless % error we obtain the more we are near to
its true value.
8/6/2019 Expt1 - For Oral Report
15/22
15
Applications
2) What do you mean by error? What are thetypes of error? What are the errors you
encountered in this experiment?
Error because the group was not able to perfectly
reach the accepted value of density. There was a
small margin of error. In measurement there are two
types of error. These are random and systematic
errors. The group were able to encounter random
errors. Some of the values increased and decreased
due to different approximations of each member.
8/6/2019 Expt1 - For Oral Report
16/22
16
Applications
3) Sketch
a. a vernier caliper that reads 3.48 cm
8/6/2019 Expt1 - For Oral Report
17/22
17
Applications
3) Sketch
b. a micrometer caliper that reads 7.05 mm
8/6/2019 Expt1 - For Oral Report
18/22
18
Applications
4) A student weigh himself using a bathroomscale calibrated in kilograms. He reported his
weight in pounds. What is the percentage error
in his reported weight if he uses this
conversion: 1 kg = 2.2 pounds? The standard
kilogram is equal to 2.2046 pounds.
0.21 %
8/6/2019 Expt1 - For Oral Report
19/22
19
Applications
5) In an experiment on determination of mass ofa sample, your group consisting of 5 students
obtained the following results: 14.34 g, 14.32 g,
14.33 g, 14.30 g and 14.23 g. Find the mean,
a.d. and A.D. Suppose that your group is
required to make only four determinations for
the mass of the sample. If you are the leader of
the group, which data will you omit?Recalculate the mean, a.d. and A.D. without
this data. Which results will you prefer?
8/6/2019 Expt1 - For Oral Report
20/22
20
Applications
Answer #5
Set 1 (with 5 data)
mean=14.304g
a.d.=14.304 gA.D=6.40g
Set 2 (with 4 data)
14.23 g was omittedmean=14.3225g
a.d=14.3225g
A.D=7.16g
The group chose the 2nd set
of data with only 4
determinations for the massof the sample. The mass
omitted from the data is
poor in precision; therefore
it is not reliable as comparedto other data. Including the
omitted data will only
increase the % error.
8/6/2019 Expt1 - For Oral Report
21/22
21
Applications
6) Give other parts of the body that are beingused for measurement even today. What are
some properties to be a standard of
measurement?
The use of the hand which is about three or
four inches. This measurement is still used to
reckon the height of horses. The thumb whichis probably the basis of the measurement now
called an inch.
8/6/2019 Expt1 - For Oral Report
22/22
Prepared by: Group 1 III Bio 2
Jack Danielle Abuan
Jenn Marie Vannesa Alcalde
Pocholo Mari Arabit Chariz Shane Atienza
Aaron Agustine Aurelio