Physics

Car Crash Calculator

Estimate the average impact force of a crash.

Mass

Impact speed

Crush distance

Calculated Output

Average force (N) 270,000

Deceleration 22.936

Formula: F = ½·m·v² ÷ d

Step-by-Step Breakdown

1. Values used:

2. Mass = 1,200

3. Impact speed = 15

4. Crush distance = 0.5

6. Average force = 270,000N

7. Deceleration = 22.936

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The math behind it

Average force F = ½·m·v² ÷ d. A longer crumple distance lowers the force, which is why crumple zones save lives.

1200 kg at 15 m/s crushing 0.5 m → 270 kN (about 23 g).

Why do crumple zones help?

They increase the stopping distance, reducing the peak force on occupants.