Forces and Motion for Third Grade

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Lessons in this unit: Lesson 1 - Force and Motion Lesson 2 - Balanced and Unbalanced Forces Lesson 3 - Energy Transfer Lesson 4 - Gravity Lesson 5 - Friction and Air Resistance Lesson 6 - Magnetic Force Lesson 7 - Electrostatic Force Lesson 8 - Start Your Engines Lesson 9 - Design Challenge Using Magnets

Ask questions about what would happen if a variable is changed.

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 not quantitative addition of forces are used at this level.)

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.)

Patterns of change can be used to make predictions

Cause and effect relationships are routinely identified, tested, and used to explain change.

Forces and Motion for Third Grade

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Science and Engineering Practices

Disciplinary Core Ideas

Crosscutting Concepts