SPM Physics: AHA! Bigger Ball – Faster Fall!

 

Two balls of the same material are dropped from the same height: one big, one small. Students often think: bigger ball → bigger air resistance → slower. But physics says otherwise.

• Ball A (larger radius):
  • Larger mass → larger weight
  • Air resistance increases, but weight increases more significantly
  • Final velocity higher, time shorter

• Ball B (smaller radius):
  • Smaller mass → smaller weight
  • Air resistance smaller, but weight much smaller too
  • Final velocity lower, time longer

SPM clue:

1️⃣ Both weight and air resistance increase with size.

2️⃣ But not equally.

3️⃣ Weight dominates → bigger ball falls faster.

Exam trap:

✗ Don’t focus on one factor only.

✓ Compare all effects → Cause → Effect → Result.

AHA! Bigger ball, bigger weight, faster fall. Not by sight, but by INSIGHT!

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