Georgia S4P3.a
The Standard
Plan and carry out an investigation on the effects of balanced and unbalanced forces on an object and communicate the results.
Georgia Standards of Excellence for Science · Obtain, evaluate, and communicate information about the relationship between balanced and unbalanced forces.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students design a fair test that compares equal and unequal pushes or pulls on the same object. They observe and record changes in speed, direction, or rest, then explain the results with evidence.
What Mastery Looks Like
- A student can choose what to change, what to measure, and what to keep the same. They use results to explain that balanced forces do not change motion, while unbalanced forces change speed or direction.
Common Misconceptions
- Students often think a moving object must have an unbalanced force acting on it. They may also think balanced means no forces are present, rather than equal forces producing no change in motion.
How to Assess It
- Give each pair a toy car, two strings, and two spring scales. Ask them to test equal and unequal pulls, record the motion, and write one evidence-based conclusion.
Lesson moves
Ways to Teach It
Attach two spring scales to a toy car, pull equally and unequally, then chart how the car moves in each trial.
Show a photo of tug-of-war and ask, “What force evidence would prove the pulls are balanced?”
Students sort scenario cards into balanced or unbalanced, then earn a point by explaining each choice with a motion change.
Analyze a soccer ball before, during, and after a kick, naming when forces are balanced and when its motion changes.
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Printable S4P3.a Worksheet
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Related Standards
- SKP2.a
Plan and carry out an investigation to determine the relationship between an object's physical attributes and its resulting motion (straight, circular, back and...
- S4P3
Obtain, evaluate, and communicate information about the relationship between balanced and unbalanced forces.
- S2P2.a
Plan and carry out an investigation to demonstrate how pushing and pulling on an object affects the motion of the object.
- S8P3.b
Construct an explanation using Newton's Laws of Motion to describe the effects of balanced and unbalanced forces on the motion of an object.
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