Chapter 2. Milbank High School The Science of Physics Measurements Vocabulary. Ammann. Matter, Energy, & Ideas. Matter: Something that occupies space and has mass. Energy: The ability to do work. Law of Conservation of Energy and Matter: Energy and Matter are neither created nor
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Milbank High School
The Science of Physics
Matter: Something that occupies space and has mass.
Energy: The ability to do work.
Law of Conservation of Energy and Matter:
Energy and Matter are neither created nor
destroyed but only changed in form.
Matter and Energy are interchangeable:
E = mc2
Hypothesis-- Scientific Guess.
Theory-- An idea with much supporting evidence.
Law or Principle-- It's proved. No exceptions.
It's hot in here.
He’s a Shorty.
Optical Illusions fool the eye.
Objective observation(quantitative)-- is measured.
It is factual.
It's 22oC in here.
He’s 1.7 meters tall.
He's 94 cm around.
Since the formal practice of Science began, Scientists have needed a definite way to both record and share their findings with the world
What are they?
How do you use them?
1 METER BAR
Accuracy means that a measurement is close to the accepted value.
Precision means that consistent results are obtained. A measurement can be precisely inaccurate.
Kilogram bathroom scale.
Significant Digits are those that can be accurately measured.
The Rule for Sig. Digs. is to round off to the least accurate number of Sig. Digs. in the measurement.A chain is only as strong as its weakest link.
How many significant digits are in each of the following?
a. 903.2 b. 0.009 0 c. 0.007 d. 0.02
e. 90.3 f. 0.090 0 g. 0.008 0 h. 70
i. 900.0 j. 99 k. 0.049 l. 5.000 2
Scientific Notation means to change your answers into "Standard Form" which is whole number then decimal. e.g. 5.29 X 108.
Change to scientific notation:
f. 23.5 X 105
g. 0.002 X 10-3
h. 423.2 X 10-14
i. 313 X 108
j. 5689 X 10-22
The correct answer is 30.24 m
X 2.1 cm
The answer would then be 6.8cm
Orders of Magnitude-- Powers of Ten
Direct Proportion-- up gives up.
Inverse Proportion-- up gives down.
Interpolation--finding points between points.
Extrapolation-- finding points beyond the last point.
Scalar-- gives magnitude only. 50 km/hr.
Vector--gives magnitude & direction. 50 kph Northeast. It is represented by an arrow.
Video: Powers of Ten
As the volume increases, so does the mass.
As the speed
time for the
Matter-- has mass and occupies space.
Mass -- quantity of matter measured by inertia.
Inertia-- resistance to change in motion.
Density = mass/volume. i.e.
H20 1g/cc, Fe 8g/cc, Pb 11g/cc, Hg 14g/cc, Au 19g/cc
Energy-- ability to do work.
Potential Energy is stored energy, fuel, wound spring
Kinetic energy is in motion, car zipping along.
Law of Conservation of Matter & Energy--
Matter & energy cannot be created nor destroyed but only changed in form.
E = mc2
D = DensityM = MassV = Volume
D = M/V
Find the density of a sample whose mass is 25.0 g and whosevolume is 82.3 cm3.
Find the mass of a sample whose density is 8.2 g/ cm3 andwhose volume is 52.0 cm3.
Find the volume of a sample whose mass is 250 g and whosedensity is 6.3 g/cm3.