1.2 : Measurement

Scientists use standardized units because:

• it allows for consistent communication and comparison of measurements.

• it is a tradition in the scientific community.

• it is required by law in most countries.

• it simplifies the process of scientific experimentation.

The SI base units for time, length, mass, and temperature are:

• seconds, meters, kilograms, and kelvin

• minutes, centimeters, grams, and celsius

• hours, kilometers, pounds, and fahrenheit

• days, inches, ounces, and rankine

Which of the following is a derived unit?

• Meter

• Kilogram

• Liter

• Second

Scientific notation is used in calculations because:

• it simplifies the representation of very large or very small numbers.

• it makes calculations more complex.

• it is a requirement in all scientific fields.

• it is the only way to represent numbers.

What skill will students practice that involves calculations with units and scientific notation?

• Calculating with units and scientific notation

• Understanding scientific theories

• Conducting experiments

• Writing scientific reports

Tags

NGSS.HS-ESS2-6

NGSS.HS-PS3-1

What important skill related to units will students learn and practice?

• Understanding units of measurement

• Solving complex equations

• Reading comprehension

• Creative writing

Tags

NGSS.HS-PS2-1

NGSS.HS-PS4-1

What is the definition of 'base unit'?

• A fundamental unit in a system of measurement that is defined arbitrarily and not by combinations of other units.

• A unit derived from the base units of a system of measurement.

• A unit used to measure the intensity of light.

• A unit used to measure the speed of sound.

The definition of 'second' is:

• A unit of time equal to one sixtieth of a minute

• A unit of distance

• A unit of weight

• A unit of temperature

The definition of 'meter' is:

• A unit of length in the metric system

• A device for measuring time

• A type of musical instrument

• A unit of weight in the metric system

The definition of 'kilogram' is:

• The base unit of mass in the International System of Units (SI), equal to the mass of the International Prototype of the Kilogram (IPK), a platinum-iridium alloy cylinder kept at the International Bureau of Weights and Measures in France.

• A unit of weight equal to 1000 grams.

• A unit of mass equal to 2.20462 pounds.

• A unit of measurement used to quantify the amount of matter in an object.

Tags

NGSS.HS-PS1-7