Describe the ways in which groups and nations interact with one another to try to resolve problems in such areas as trade, cultural contacts, treaties, diplomacy, and military force. 2.4 Students understand basic economic concepts and their individual roles in the economy and demonstrate basic economic reasoning skills. Describe food production and consumption long ago and today, including the roles of farmers, processors, distributors, weather, and land and water resources. The motion of objects can be observed and measured. Students know an object s motion can be described by recording the change in position of the object over time.
Students know the way to change how something is moving is by giving it a push or a pull.
The size of the change is related to the strength, or the amount of force, of the push or pull. Students know objects fall to the ground unless something holds them up. Students know magnets can be used to make some objects move without being touched. Students know sound is made by vibrating objects and can be described by its pitch and volume. Plants and animals have predictable life cycles.