B. Objects and substances can be classified by their physical and chemical properties. Mass is the amount of matter (or "stuff") in an object. Weight, on the other hand, is the measure of force of attraction (gravitational force) between an object and Earth.
The concepts of mass and weight are complicated and potentially confusing to elementary students. Hence, the more familiar term of "weight" is recommended for use to stand for both mass and weight in grades K-5. By grades 6-8, students are expected to understand the distinction between mass and weight, and use them appropriately.
Clarification for grades K-2: The use of the more familiar term ‘weight’ instead of the term “mass” is recommended for grades K-2.
Clarification for grades 3-5: In grade 3, introduce the term mass as compared to the term weight. In grade 4, investigate the concept of weight versus mass of objects. In grade 5, discuss why mass (not weight) is used to compare properties of solids, liquids and gases.
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Educational Game
Lesson Plans
Original Student Tutorials
Perspectives Video: Teaching Idea
Teaching Idea
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Video/Audio/Animations
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Original Student Tutorials Science - Grades K-8
Explore atoms--the smallest unit of matter--and how they are made up of protons, neutrons, and electrons in this interactive tutorial.
Follow the story of how the model of the atom has changed over time in this interactive tutorial.
Student Resources
Original Student Tutorials
Follow the story of how the model of the atom has changed over time in this interactive tutorial.
Type: Original Student Tutorial
Explore atoms--the smallest unit of matter--and how they are made up of protons, neutrons, and electrons in this interactive tutorial.
Type: Original Student Tutorial
Video/Audio/Animations
Students determine the number of protons, electrons, neutrons, and nucleons for different atoms
Type: Video/Audio/Animation
A collection of crossword puzzles that test the knowledge of students about some of the terms, processes, and classifications covered in science topics
Type: Video/Audio/Animation
Virtual Manipulative
Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!
Type: Virtual Manipulative
Parent Resources
Perspectives Video: Teaching Idea
Many students are initially daunted by the periodic table, but this science teacher has an idea to chip away at their intimidation by building atomic models.
Download the CPALMS Perspectives video student note taking guide.
Type: Perspectives Video: Teaching Idea