Today's Data
What is the information collected from scientific observations called?
Data
What dimension of an object can change depending on its position on the earth?
Weight
Name one possible source of error in data.
Instrument markings, environmental conditions, the observer, damaged instruments
What is the SI unit for length?
meter (m)
How many significant digits?
273.003 cm
6 SDs
What term is defined as “a comparison of a dimension of an object to an appropriate standard”?
Measurement
What can be used to measure the amount of matter in an object?
With a scale or balance
What term describes the exactness of a measurement?
Precision
What is the SI unit for mass?
kilogram (kg)
How many significant digits?
0.00730 kg
3 SDs
What are the two types of data that scientists might collect?
Qualitative and quantitative
What can you measure to determine the amount of matter in an object?
Mass, weight, density, or volume
When recording data, how precise should the measurement be?
Read the known markings and estimate one extra digit.
The measurement is rounded to one-tenth of the smallest decimal subdivision on the instrument scale.
What dimension is measured in seconds (s)?
Time
How many significant digits?
109.0 kg
4 SDs
A scale is calibrated to one-tenth of a kilogram. Which measurement is reported correctly?
A) 43 kg
B) 0.0027 kg
C) 105.39 kg
D) 47.4 kg
105.39 kg
105.3 kg is measured directly. 9 hundredth of a kilogram is estimated.
What describes the amount of matter within a specific amount of space?
Volume
What was not standardized during the Middle Ages which made science difficult?
Units
A newton (N) is a measure of what?
Weight or force
Convert into scientific notation:
2,380.8
2.3808 x 103
Measured data contains what two parts?
A number and a dimensional unit
What is the formula for the volume of a rectangular solid?
V = lwh
(volume = length x width x height)
What is the difference between accuracy and precision?
Accuracy describes how close a measurement is to the actual value; precision describes the exactness of a measurement.
What measuring system is based on powers of 10?
Metric system
Convert into scientific notation:
0.00726
7.26 x 10-3