3.PS2.1 Plan and conduct investigations on the effects of balanced and unbalanced forces on the motion of an object.
3.PS2.1.1 Each force acts on one particular object and has both strength and a direction. An object at rest typically has multiple forces acting on it, but they add to give zero net force on the object. Forces that do not sum to zero can cause changes in the object's speed or direction of motion. (Boundary: Qualitative and conceptual, but quantitative addition of forces is not used at this level.)
3.PS2.2 Make observations and/or measurements of an object's motion to provide evidence that a pattern can be used to predict future motion.
3.PS2.2.1 The patterns of an object's motion in various situations can be observed and measured; when that past motion exhibits a regular pattern, future motion can be predicted from it. (Boundary: Technical terms, such as magnitude, velocity, momentum, and vector quantity are not introduced at this level, but the concept that some quantities need both size and direction to be described is developed)
3.PS2.3 Ask questions to determine cause and effect relationships of electric or magnetic interactions between two objects not in contact with each other.
3.PS2.3.1 Electric and magnetic forces between a pair of objects do not require that the objects be in contact. The sizes of the forces in each situation depend on the properties of the objects and their distances apart and, for forces between two magnets, on their orientation relative to each other.
3.PS2.4 Define a simple design problem that can be solved by applying scientific ideas about magnets.
3.PS2.4.1 Electric and magnetic forces between a pair of objects do not require that the objects be in contact. The sizes of the forces in each situation depend on the properties of the objects and their distances apart and, for forces between two magnets, on their orientation relative to each other.
3.LS4.3.2 Changes in an organism's habitat are sometimes beneficial to it and sometimes harmful.
3.LS4.4 Make a claim about the merit of a solution to a problem caused when the environment changes and the types of plants and animals that live there may change.
3.LS4.4.1 When the environment changes in ways that affect a place's physical characteristics, temperature, or availability of resources, some organisms survive and reproduce, others move to new locations, yet others move into the transformed environment, and some die.
3.LS4.4.2 Populations live in a variety of habitats, and change in those habitats affects the organisms living there.
ESS2 Earth's Systems
3.ESS2.1 Represent data in tables and graphical displays to describe typical weather conditions expected during a particular season.
3.ESS2.1.1 Scientists record patterns of the weather across different times and areas so that they can make predictions about what kind of weather might happen next.
3.ESS3.1.3 Engineers improve existing technologies or develop new ones to increase their benefits (e.g., better artificial limbs), decrease known risks (e.g., seatbelts in cars), and meet societal demands (e.g., cell phones).