SPM Physics: AHA! Newton’s Third Law – Equal Means Equal!

 

Students often think a bigger or stronger object exerts a bigger force. That’s wrong. Newton’s Third Law states: forces between two interacting objects are equal in magnitude and opposite in direction.

⚡ Quick Facts (Exam-Ready)

• Student pushes wall with 50 N → Wall pushes student back with 50 N.

• Equal magnitude, opposite direction.

• Bigger object ≠ bigger force.

• Law applies to all interactions: wall vs student, Earth vs Sun.

👉 Exam keywords: Equal magnitude, Opposite direction.

📐 SPM Scoring Points

1️⃣ Definition: When an object exerts a force on another, the second object exerts an equal and opposite force on the first.

2️⃣ Application: Force by student on wall = force by wall on student (equal and opposite).

AHA! Equal means equal. Not by sight, but by INSIGHT!

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