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::4/4 = 1 |
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::25 X 1 = 25 |
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:L. Graphing in Physics |
:L. Graphing in Physics |

## Revision as of 18:49, 25 January 2010

- A. Define
- Physics-
- Equilibrium-

- B. Scientific Methods – the Big Lie - these methods allow us to say "This is what we think is true, based on current information."
- Problem, usually stated as a question
- Hypothesis- an educated guess, that can be tested
- Experiment
- Theory- an explanation that has been tested

- - - - - - - - - - - -
- Law-

- C. Experimental Design
- Independent variable-
- Dependent variable-
- Control Group-
- Bias-

- D. Units- a noun that follows a number to explain a measurement
- meter --> distance
- meters squared --> Area
- Liter = dm3 -->Volume
- second --> time
- gram = mass of 1mL of water
- Define: Length, Area, Volume, mass
- Compare/contrast mass and volume
- List comparing English and SI units...

- E. Affixes
- (see "The Chart")

- F. Measuring
- 1. Issues to consider before you start measuring
- Concept:
- Units:
- Scale
- Smallest amount that can be measured:
- Largest amount that can be measured:
- Increment:
- Precision:

- 2. Issues to consider while measuring
- Parallax
- Meniscus
- “Burning an inch”
- Estimation

- 3. Measuring Mindset
- a. Measure and record the "at least"
- b. Estimate 1 more digit
- c. Record correct units

- 1. Issues to consider before you start measuring

- G. Conversions
- 4/4 = 1
- 25 X 1 = 25
- ...

- H. Metric Conversions ...

- I. Scientific Notation
- 1.Rules
- always write number with one digit to the left of the period
- if num >= 10, exp is positive
- if num <1, exp is negative
- if 1>= num <10, exp is 0
- -------------------------------------
- if exp is positive, move decimal to right
- if exp is negative, move decimal to left

- 2.Examples

- 1.Rules

- J. Significant Digits (sig fig)
- 1)Precision vs. Accuracy
- 2)The measuring device determines the precision of the measurement.
- 3)Measurements must make sense for that given situation
- Examples:
- 4016m (4) 55mph
- 4160s (3) 45.5mL

- K. Problem Solving strategy
- Read the problem
- Make a prediction including units
- Take inventory - What do we know and what do we need to know?
- Choose an equation
- Solve for x
- Substitute
- Calculate and simplify units
- Verify - are those the units you expected? Does the answer make sense?

- L. Graphing in Physics
- includes the slope equation

- M. Relationships
- 1. Linear (Direct)
- 2. Reciprocal (Inverse)
- 3. Exponential (Quadratic)
- The truth: In the real world graphs are a combination of 1-3

- N. Vectors
- 1.Define through examples
- Equilibrium = Net Force (¹) = No acceleration (1D)

- 2.Vector Addition using Graphical Method

- 1.Define through examples

- 3.Vector Addition using Analytical methods