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What Is Physics?
Pearland ISD
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Mathematical concepts
Physics experiments involve the measurement of a variety of quantities.
These measurements should be accurate and reproducible.
The first step in ensuring accuracy and reproducibility is defining the units in which the measurements are made.
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The Role of Units in Problem Solving
Reasoning Strategy: Converting Between Units
1. In all calculations, write down the units explicitly.
2. Treat all units as algebraic quantities. When identical units are divided, they are eliminated algebraically.
3. Use the conversion factors located on the page facing the inside cover. Be guided by the fact that multiplying or dividing an equation by a factor of 1 does not alter the equation.
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Dimensional analysis
Dimensional analysis - is a process used in determining what units would result from a calculation. In order to be correct, a calculation must produce units of the proper dimension.
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Converting unitsThe Role of Units in Problem Solving
To convert units, multiply the quantity you wish to convert by fractions equaling one; that is, fractions with equivalent units in the numerator and denominator.
For example: convert 20 m/s to km/hour.
km/hr 72hr 1
min 60
min 1
s 60
m 1000
km 1
s
m20
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The Role of Units in Problem Solving
Express the speed limit of 65 miles/hour in terms of meters/second.
Use 5280 feet = 1 mile and 3600 seconds = 1 hour and 3.281 feet = 1 meter.
second
feet95
s 3600
hour 1
mile
feet 5280
hour
miles 65 Speed
second
meters29
feet 3.281
meter 1
second
feet95 Speed
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The Role of Units in Problem Solving
[L] = length [M] = mass [T] = time Is the following equation dimensionally
correct?
YES!!!
DIMENSIONAL ANALYSIS
221 atx
LTT
LL 2
2
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1.3 The Role of Units in Problem Solving
Is the following equation dimensionally correct?
Yes!!
vtx
LTT
LL
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Trigonometry h
hosin
h
hacos
a
o
h
htan
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1.4 Trigonometry
m2.670.50tan oh
m1.80m2.670.50tan oh
a
o
h
htan
Use Trig to calculate the height of the building below (show your work)
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Pythagorean theorem
222ao hhh
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What is physics? Physics is the study of the physical
world, that is, the world of matter and energy.
Physics is everywhere; any problem that deals with temperature, size, motion, position, shape, or color involves physics.
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Areas Within Physics
Name Subjectsmotion and its causesheat and temperaturespecific types of repetitive motionlightelectricity, magnetism, and light
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Areas Within Physics
Name Subjectsmechanics motion and its
causesheat and temperaturespecific types of repetitive motionlightelectricity, magnetism, and light
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Areas Within Physics
Name Subjectsmechanics motion and its
causesthermodynamics heat and
temperaturespecific types of repetitive motionlightelectricity, magnetism, and light
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Areas Within Physics
Name Subjectsmechanics motion and its
causesthermodynamics heat and
temperaturevibrations and waves
specific types of repetitive motionlightelectricity, magnetism, and light
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Areas Within Physics
Name Subjectsmechanics motion and its
causesthermodynamics heat and
temperaturevibrations and waves
specific types of repetitive motion
optics lightelectricity, magnetism, and light
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Areas Within Physics
Name Subjectsmechanics motion and its
causesthermodynamics heat and
temperaturevibrations and waves
specific types of repetitive motion
optics lightelectromagnetism electricity,
magnetism, and light
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Areas Within Physics
Name Subjects
relativity Particles moving at any speed, including very high speed
Behavior of submicroscopic atomic particles
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Areas Within Physics
Name Subjects
relativity Particles moving at any speed, including very high speed
quantum mechanics Behavior of submicroscopic atomic particles
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From: Holt Physics Teaching Transparencies
Here is an example of how these areas of physics are applied in everyday life.
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What area of physics is most relevant to you?
A high school football game? Food preparation for the prom? Playing in the school band? Lightning in a thunderstorm? Wearing a pair of sunglasses
outside in the sun?
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Physics uses the scientific method. –
Scientific method – an organized process used to conduct scientific investigations or experiments.
There is no one single procedure, but certain processes are usually present.
This is the only guide to good science practice
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Processes in the Scientific Method Make observations and collect
data, that lead to a question. Formulate and objectively test
hypothesis by experimentation. Interpret results, and revise the
hypothesis and experiment if necessary.
State conclusions, whether or not the data collected supports the hypothesis. The conclusion should be stated in a
form that can be evaluated by others.
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How Physicists Simplify Reality
System – a set of items or interactions considered a distinct physical entity for the purpose of study; usually, this involves a single object
and the items that immediately affect it.
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How Physicists Simplify Reality
Model – a replica or description designed to show the structure or workings of an object, system, or concept.
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The Scientific Method Using models can help build
hypotheses. Hypothesis –
a possible answer, based on background information available.
provides a plan or model for investigation or experimentation.
Controlled experiment – an experiment involving the manipulation of a single variable or factor.
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The Scientific Method Independent variable (horizontal-axis)-
the quantity that is manipulated by the experimenter in an experiment in order to determine its effect on another quantity.
Dependent variable (vertical-axis) - the quantity that is being measured; the experimenter tries to determine how the dependent variable is affected by changes in the independent variable.
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Graphing experimental results
When graphing the results of an experiment, the independent variable is graphed on the horizontal axis, and the dependent variable is graphed on the vertical axis.
0
20
40
60
80
100
1 2 3 4
Independent Variable (varied by experimenter)
Dependent
Vari
able
(m
easu
red b
y
experi
mente
r)
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Inquiry – Pendulum Pre-lab
Definition: Pendulum Oscillation Materials used
Objective of the lab: Investigate pendulum motion, gather data
and plot the data in a way that will allow you to draw meaningful conclusions
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Chapter 1
III. Measurements in Physics
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Dimension In physics, dimension refers to the type
of quantity being measured. For example:
Both the height of a building and the distance from here to Dallas have the dimension of length, though they are usually measured in different units.
A football player’s age in years and the number of seconds he takes to run 40 yards are both measurements of the time dimension.
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Measurement in Experiments
SI Base Units of Measurements
Dimension Unit Symbol
length meter m
time second sec or s
mass kilogram kg
current ampere A
temperature kelvin K
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Measurement in Experiments
SI Base Units of Measurements
unit symbol
luminous intensity
candela cd
amount of a substance
mole mol
All other units are called derived units because they are based on combinations of two or more of the SI base units.
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Accuracy and Precision
Accuracy – how close a measured value is to the true or accepted value of the quantity being measured
Precision – the degree of exactness with which a measurement is made and stated
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Practice: Accurate, Precise, Both or Neither
The following students measure the density of a piece of lead three times. The density of lead is actually 11.34 g/cm3. Considering all of the results, whose results were accurate? Whose were precise? Were any both accurate and precise? If so, whose?
a. Rachel: 11.32 g/cm3, 11.35 g/cm3, 11.34 g/cm3
b. Daniel: 11.43 g/cm3, 11.44 g/cm3, 11.42 g/cm3
c. Leah: 11.55 g/cm3, 11.34 g/cm3, 11.04 g/cm3
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Discovery Mini – Lab: Accuracy and Precision
Now go back to the Accuracy and Precision Mini-lab handout that you completed earlier today and complete your explanations for the ruler you think is better
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Chapter 1
IV. The language of Physics
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Tools to make data easier to understand. Tables
Very useful for displaying data precisely.
The relationship between the quantities may not be clear.
Graphs Visually display the relationship
between two quantities. The precision of the data is limited by
the scale of the graph.
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Tools to make data easier to understand. – part of this slide is not in your
notes
Equations Mathematically display the
relationship between two quantities. Can be manipulated using algebra:
) / timedistance (velocity t
d v
x time) velocity (distance t v d
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Symbols used in physics equations
D means “difference” or “change in.”
S means “sum” or “total.” Quantity Symbol Units Unit
Abbrev.
Change in position
Dx or Dy
meters m
Time interval
Dt seconds s
Mass m kilograms kg