The branch of science that involves the study of the physical world.

• Physics

• Chemistry

• Biology

• Calculus

The steps physicists follow to investigate a problem.

• Hypothesis

• Scientific method

• Research

• Analysis

A possible explanation for a problem.

• Opinion

• Hypothesis

• Observation

• Experiment

A representation of an idea, event, structure, or object that helps people better understand it.

• Hypothesis

• Law

• Theory

• Model

An explanation of things or events based on knowledge gained from many observations and investigations.

• Hypothesis

• Theory

• Law

• Model

A statement about what happens in nature and seems to be true all the time

• Law

• Theory

• Model

• Hypothesis

The system used by the worldwide scientific community to take measurements.

• US system

• English system

• Metric system

• International System of Units

The method of treating units of measurement as algebraic quantities that can be cancelled.

• Unit conversion

• Dimensional analysis

• SI

• Metric system

The valid digits in a measurement

• Significant figures

• Accuracy

• Precision

• Natural numbers

A comparison between an unknown quantity and a standard

• Accuracy

• Precision

• Measurement

• Significant figures