Balanced & Unbalanced Forces
Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object
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Balanced & Unbalanced Forces means testing how balanced and unbalanced forces affect motion. We will practise once together, then check a fresh example.
Spend about 12 minutes on Balanced & Unbalanced Forces, then checking one fresh example.
Distinguish zero resultant force from an absence of forces.
Distinguish zero resultant force from an absence of forces.
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Practice this concept
Start practiceBalanced & Unbalanced Forces practice
Link balanced and unbalanced forces to motion.
Free · no login · no ads · Practice answers and completion are not saved. Parent observation remains the lesson record.
Learning resources
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PhET Interactive Simulations · Practice link — not the full lesson
Balancing Act
Before you open · source notes
Balancing Act supports hands-on exploration for Balanced & Unbalanced Forces. Not every lab worksheet.
Free interactive page, no sign-in required for the tested path.
Before you openAsk the learner what they changed in the sim or page and what they observed.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public PhET Interactive Simulations page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
PhET Interactive Simulations. “Balancing Act.” External page; Gakuva does not copy, host, embed, or redistribute materials.
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Check understanding
- Define balanced forces (equal in size, opposite in direction — no change in motion) and unbalanced forces (cause motion to change)
- Plan a fair test investigating how different force sizes affect an object's motion
- Use results as evidence to explain when forces are balanced versus unbalanced
“Can your child explain why a book sitting on a table doesn't move (balanced forces) but slides when you push it (unbalanced forces)?”
Curriculum record
- Type
- Procedural
- Subject
- Science
- Domain
- Forces & Motion
- Age range
- Ages 8–12
Standards