The practical physics objectives are to link theoretical study to application, investigate laws, and determine values of constants. An experiment is a test under controlled conditions to demonstrate truth, examine hypotheses, or test untried ideas. Measurements in physics include fundamental quantities like time and length, and derived quantities like acceleration. Errors in measurement include systematic errors from faulty equipment and random errors from misreading scales. A graph of temperatures in New York City showed readings from 0-80 degrees F over 6 days, with the lowest at 43 degrees and highest at 67 degrees. Accuracy refers to measurement correctness while precision refers to reproducibility between repeated measurements. Writing a lab report includes stating the objective, listing equipment, presenting theory, reporting results and calculations, and drawing a

1. Mr. Gazy Khatmi .R ALBEDRI

2. Practical physics Objectives
The purpose of the practical physics is to link the
theoretical study with applied .
- To investigate the laws .
- To determined the value (e.g. the value of the
gravity constant , refractive index of water etc
- To get skill of how to deal with tools and devices

3. What is an Experiment?
A test under controlled conditions that is made to demonstrate a
known truth, examine the validity of a hypothesis, or determine the
efficacy of something previously untried.
Multiple choice
A. To prove what I know is right
B. To prove that he is wrong
C. To test an idea
D. To see what happens
E. All of the above

4. Measurement
Measurement : when you visit the
doctor for a checkup, many
measurements are taken: your height,
weight, blood pressure, and heart rate.
Even your vision is measured and
assigned a number.

5. Physical Quantities and it
Measurements :
 The physical quantities divided to two type :
1- Fundamental quantities (e.g. Time ,Temperature ,
Length etc)
2-Non Fundamental quantities (e.g. acceleration ,Area
etc

6. Errors
 Systematic errors (Regular errors)
An error that remains constant through out an experiment and
cannot therefore be detected. For instance:
 Hardware
Lets look at our ruler again.

7. Random errors
One form of scale-
reading error that often
afflicts beginners in the
science laboratory is
failure to properly align
the eye with the part of
the scale you are
reading. This gives rise
to random
error. Random refers to
the change in the
apparent position of an
object when viewed
from different points.

8. Zero Error
 It is the incorrect
reading that you
have on your
instrument when
it is measuring
something that
*you know*
should read
zero.

9. The Graph

10. QUESTION ANSWER
1. What is the title of
this line graph?
Temperatures in New York City
2.
What is the range
of values on the
horizontal scale?
1 to 6
3.
What is the range
of values on the
vertical scale?
0 to 80
4. How many points
are in the graph? 6
5.
What was the
lowest temperature
recorded?
43° F
6.
What was the
highest
temperature
recorded?
67° F
7.
At what point did
the temperature
dip?
Day 3: 50°
F

12. Accuracy and precision
We tend to use these two terms interchangeably in our ordinary
conversation, but in the context of scientific measurement, they have
very different meanings:
Accuracy refers to how closely the measured value of a quantity
corresponds to its “true” value.
Precision expresses the degree of reproducibility, or agreement
between repeated measurements.

14. Example:
• ______?
• Not
•
• Not
• ______?
• ______?
• Accurate
and
• Precise

15. How to write lab report :
 1- Objective , Aim or goal
 2- Apparatus
 3- Theory
 4-Results
 5-calclations
 6-concolustion

16. Requirements in laboratory
 Lab coat
 scientific calculator
 A box of Engineering