Virginia SOL PS.8.b

ScienceGrades 7–8Physical Science

The Standard

motion is described by Newton's laws.

Virginia Standards of Learning for Science · The student will investigate and understand that work, force, and motion are related. Key ideas include

Teacher's field guide

What Students Need to Do: Students explain how balanced and unbalanced forces affect an object's motion. They use inertia, force, mass, acceleration, and action-reaction pairs to predict motion.
What Mastery Looks Like: Students can draw a force diagram and predict whether an object will speed up, slow down, or change direction. They can explain each prediction using the correct law and evidence.
Common Misconceptions: Students may think a moving object needs a constant forward force to keep moving. They may think action-reaction forces cancel, although the forces act on different objects. Some assume greater mass always means greater acceleration.
How to Assess It: Give students a cart with doubled mass and the same applied force. Ask them to predict its acceleration and identify the law that supports their answer.

Lesson moves

Use toy carts, spring scales, and added masses to compare acceleration when force or mass changes.
Ask students to write why a passenger moves forward when a bus stops suddenly, using inertia in the explanation.
Play a force-pair card sort with examples such as foot-ground and balloon-air, then label which force acts on each object.
Analyze seat belts, bicycle helmets, and crumple zones, then explain how each affects force, acceleration, or stopping time.

Free download

A ready-to-print activity worksheet aligned to PS.8.b, with an answer key for the teacher on its own page. No account needed.

PDF, US Letter, prints cleanly in black and white.

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