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Welcome to Physics C Instructor:
Martin Mathews 562-698-8121 [email protected]
Expectations are on the Course Description page. Homework assignments are on the course calendar. Write your name inside the front cover of your textbook. Bring your lab fee of $15 to me beginning tomorrow. Due
Friday.
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Information Card
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Philosophy of Instruction for Physics C
You are the big kids. You have all had physics before. Your motivations for being in this course
vary. Your skill and interest level in different areas
of physics vary. I will try to avoid repetition of what you
already know, and will occasionally give you at least some choice as to what you work on.3
Mathews - Unit 1 AP Physics Toolkit
How do I take notes? What am I expected to do?
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Physics Toolkit Objectives
1. Students can express units in regular and scientific notation, and convert measurements from one unit to another.
2. Students can rearrange a formula in symbol form to solve for any variable. Students can check their answers using units.
3. Students know to use their calculators to solve the side of any triangle from given information.
Lesson: Physics Toolkit
Unit Conversions and numbers.
6
Students can express units in regular and scientific notation, and convert measurements from one unit to another.
Mathews - Unit 1 AP Physics Toolkit
Scientific Notation i.e. 4.32 x 105 kg
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Scientific notation is a system for communicating very small and very large numbers. For numbers in the range .001 – 1000, most scientists don’t bother. But for numbers larger or smaller than this, it is very useful, and will be a big part of this course. 2 Rules:
Rule #1: all stem numbers must be between 1 -10
Rule #2: numbers larger than 10 use positive exponents; numbers smaller than 1 use negative exponents.
Practice makes perfect…
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Scientific Regular
1. 2300 s
2. 1.08 x 10-4 N
3. 2.00 x 108 km
4. 0.0000054 m/s2
5. 108 000 000 people
6. 2.1 x 106 kgm/s
Guided Practice Time
Do the Scientific Notation worksheet to satisfy the following objective:
Students can express units in regular and scientific notation, and convert measurements from one unit to another.
Scientific notation and your calculator
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For your calculator the number 4.3 x 104 is written 4.3EE4, 4.3 EXP4. Likewise when your calculator writes 2.1EE-7 as an answer, it means 2.1 x 10-7, or .00000021. For example,
tonsx
peoplex
lbx
tonx
kg
lbkgx
534
104.1
5
102
1
1
2.2102.1
Calc code: 1.2EE4 x 2.2÷1x1÷2EE3x5÷1.4EE-5= 4714285.7… = 4.71EE6
Let the Units Rule!
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days
yearx
hours
dayx
s
hours
25.365
1
24
1
60
130.1200
Convert 1200.30 seconds into years
Scientific Measurements and Quantities
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Quantity Metric Units Common other forms
Time s
Length m
Mass kg
Derived units
Metric prefix info Metric Prefix Info: followed by either
g (grams),s(seconds) or m(meters)Factor Prefix Symbol Equation109 giga G__ 1 x 109__ = 1 G__
106 mega M__ 1 x 106__ = 1 M__
103 kilo k__ 1 x 103__ = 1 k__
100 ___ 1 x 100__ = 1 __
10-2 centi c__ 1 x 10-2__ = 1 c__
10-3 milli m__ 1 x 10-3__ = 1 m__
10-6 micro µ__ 1 x 10-6__ = 1 µ __
10-9 nano n__ 1 x 10-9__ = 1 n__
10-12 pico p__ 1 x 10-12__ = 1 p__
Changing one system to another
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some common conversion factors
Time 3600s = 1 hour 365.25 days = 1 year
mass 2.2 lbs = 1 kg 16 ounces = 1 lb 2000 lbs =1 ton
length 2.54 cm = 1 inch
5280 ft = 1 mile=1.67km 1 Å = 10-10 m
Sample problems:
1. How many picograms are there in 3.4 x 105 lbs?
2. Convert 23.4 years into seconds
3. Convert the distance to the Sun, 1.5 x 1011 m into miles..
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Guided Practice Time
• Do the Unit Conversion worksheet to satisfy the following objective:
Students can express units in regular and scientific notation, and convert measurements from one unit to another.
Lesson 2
Students can use algebra skills to rearrange formulas for any variable in any equation.
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Algebra Olympics2
2
1 IK 200 2
1att
• Algebra is the most necessary skill for this class. Without a thorough knowledge of algebra you will not be an effective problem solver.
• If you are rusty on your algebra skills; allow me to simplify.
• Rule #1: Any operation carried out on one side of an equation
MUST be carried out exactly the same to the other side.
• Rule #2: When a fraction has the same multipliers on the top and bottom of a fraction, these cancel out.
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2
2
1 IK
• Although algebra may seem crazy complicated sometimes, it is really just these two principles, and a ton a practice and patience that is needed.
• Sample 1 Rearrange this formula for x
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2
2
1kxU s
Now practice, practice, practice
Guided Practice Time
• Do the Algebra Olympics worksheet to satisfy the following objective:
2. Students can rearrange a formula in symbol form to solve for any variable.
Lesson 3
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Trigonometry Review
3. Students know how to use their calculators to solve the side of any triangle from given information.
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Soh Cah ToaSine of an angle is equal to the ratio of opposite side/hypoteneuse of an angle.
Cosine of an angle is equal to the ratio of adjacent side/hypoteneuse of an angle.
Tangent of an angles is equal to the ratio of the opposite/adjacent sides of a right triangle
A
B
xy
z
Sample problem
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34m
21°
x
Sample problem 2:
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12m
76° x
Guided Practice Time
Do the Triangles worksheet to satisfy the following objective:
3. Students know to use their calculators to solve the side of any triangle from given information.
