Science Starter!

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# Science Starter! - PowerPoint PPT Presentation

Science Starter! Perform the following conversions and dimensional analysis problems. Reflect your answer in scientific notation. 30 in  mm 12 cm  mi 50 mi/hr  m/s 25 ft /s  cm/ hr. Graphing Basics. Parts of a Graph. “Best Fit” Line.

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Science Starter!

Perform the following conversions and dimensional analysis problems. Reflect your answer in scientific notation.

30 in  mm

12 cm  mi

50 mi/hr  m/s

25 ft/s  cm/hr

### Graphing Basics

Parts of a Graph

“Best Fit” Line

Variable that is measured during an experiment (y - axis)

Variable that is controlled in an experiment (x - axis)

Distinguishing Variables

Example:

I worked for 5 hours and made \$50.

Independent: What did YOU directly control (do)?

5 hours

Dependent: What happened because of your action (measure)?

EXCEPTION: TIME is always considered an independent variable, even though it may be the quantity measured.

Types of Relationships

LINEAR

- Straight line

- Equation: y = mx + b

- Direct Relationship

Slope [Steepness of line] = (Y2 – Y1) or RISE (X2 – X1) RUN

Graphing Data

Data Chart

- Determine the independent and dependent variables

Plot Data

- Place a dot at the intersection of the two variables

Calculating Slope
• Choose any two points on the line of best fit:
• (not data points)EX: ( y = 15, x = 30) and ( y = 0, x = 0)
• Calculate slope by dividing the difference in the “y” values by the difference in the “x” values:
• EX: Slope = (15 – 0)
• (30 – 0)
• Slope = 0.5
Enclosed Area
• Shade in the region in question:
• EX: Find the area enclosed by the line of best fit and the horizontal axis between x = 0 and x = 30.
• Use geometry and the values on the axis (NOT number of blocks) to find the area of the shape made.
• EX: A = ½ bh
• = ½ (30)(15) = 225

Area = ½ bh

= ( ½ )(6)(14.5)

= 43.5