1.2 Flashcards
What are the base units of metric measurement?
Meters, grams, liters, seconds, and Celsius
What are the different prefixes in the metric system and how many base units do they have?
kilo- 1,000, base- 1, centi- 1/100, milli- 1/1,000, micro- 1/10^6, nano- 1/10^9, pico- 1/10^12
What is the difference between quantitative and qualitative observations?
Quantitative- Data using numbers. Ex: The road is 5 miles long.
Qualitative: Data with qualities and characteristics. Ex: The black road is smooth and freshly paved.
What are the mean, median, and range of a data set?
Mean: The average of the data set. Ex: 1, 2, 3 Mean= 2
Median: The middle number in a set of data. Ex: 1, 2, 3 Median= 2
Range: The difference between the largest and smallest values in the data set. Ex: 1, 2, 3
Range= 2
What is the formula for converting degrees Celsius to degrees Fahrenheit and vice versa?
Celsius to Fahrenheit:
(C) (9/5) + 32
Fahrenheit to Celsius:
(F - 32) (5/9)
What is the formula for converting Celsius to Kelvin?
Celsius to Kelvin:
C + 273
What does length measure?
The distance between two things.
What does mass measure?
How much matter is in something.
What does volume measure?
The amount of space that an object takes up.
What does time measure?
The duration of an event.
What does temperature measure?
Kinetic energy, or the degree of hot or cold of an object.
Why are conversions between units in the metric system and other system so important?
The metric system is very easy to use when organizing data because everything is organized by powers of 10. Being able to convert to the metric system is very useful because it allows you to easily convert between larger and smaller units.
True or False: Volume is the amount of matter in an object.
False: Volume is the amount of space that an object takes up. Mass is the amount of matter that an object takes up.
If your mass was 70kg on Earth, how much would your mass be on the moon?
70kg
Mass is not affected by gravitational forces.
True or False: 1mL is equal to 1cm².
False: 1mL is equal to 1cm³.
When measuring with a ruler, what decimal place do you estimate to?
You should always estimate one decimal place further than the ruler has. For example, if the ruler has lines in increments of one centimeter, you should estimate to the tenths place.
What measuring devices do you use to measure length? Mass?
Volume? Time? Temperature?
Length: A ruler or meter stick
Mass: Scale
Volume: Graduated cylinder
Time: Stopwatch
Temperature: Thermometer
What are the steps that need to be followed in order to find the standard deviation of a set of data?
Step 1: Find the mean, or average of the data by adding all of the numbers together and dividing the sum by the number of data points.
Step 2: Calculate the variance by finding the difference between each of the data points and the mean, squaring each result, then finding the average of the numbers.
Step 3: Take the square root of the variance to find the standard deviation.
Why is standard variation important?
Standard variation allows us to see how precise our data is. If the standard deviation is small, that means that the data points were relatively close together. If the standard deviation is large, then the data points are not very close together, or not as precise.
What is an independent variable?
The independent variable is the variable that is being changed and controlled. It is placed on the x-axis and is usually on the left side of a data table. This variable is manipulated to give a result.
What is a dependent variable?
A dependent variable is the variable that is measured, or the data. It is the result of the experiment from changing the independent variable. It is found on the y-axis and is generally located on the right side of a data table.
Direct Relation Graph
A direct relation graph is one where both variables are increasing. As one variable increases, the other also increases.
Indirect Relation Graph
An indirect relation graph is one where one variable increases while the other decreases.
Constant Relation Graph
A constant relation graph is one where a change in one variable does not have an affect on the other. This results in a horizontal line across the graph.
