Why Glass Cracks Faster Than a Bullet 😱 | Physics Explained

Описание: When a bullet hits glass, something unbelievable happens 😱
The cracks in the glass spread faster than the bullet itself — and this is not an illusion.

🔬 Physics Behind This:
The moment the bullet impacts the glass, it creates a powerful compressive shockwave 💥.
This wave travels through glass at the speed of sound in solids — roughly 4,000 to 6,000 meters per second ⚡, which is much faster than most bullets.

🧠 Why does the glass break so fast?
Glass is a brittle material 🧊. It can handle compression but fails quickly under tension.
When the shockwave reaches the free surface of the glass, it reflects back as a tensile wave 🔄, instantly causing cracks to form.

🧩 Crack propagation explained:
Cracks follow stress waves, not the bullet 🚫🔫.
These cracks can spread at speeds of 1,500 to 3,000 meters per second ⚙️, allowing them to reach the edges of the glass before the bullet fully passes through.

📷 What you see in slow-motion videos:
• Circular and radial cracks 🌐
• Shattering before exit 🪟
• Physics acting faster than human reaction time ⏱️

🚀 Key takeaway:
Matter moves slow.
Waves move fast.
That’s why physics always wins.

🔍 WHY THIS MATTERS

This phenomenon is studied in:
High-speed ballistic testing 🎯
Forensic glass analysis 🕵️
Military and automotive safety research 🚗
Fracture mechanics & material science 🧪

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