Impact Force Calculator
Calculate average force during an impact from mass, velocity, and time.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
Can't find what you need?
Request a ToolHow to Use the Impact Force Calculator
Enter the mass of the object, its velocity at the moment of impact, and the duration of the impact. The calculator computes the average force during the collision.
About Impact Force
Impact force is the average force exerted during a collision. It derives from the impulse-momentum theorem: the change in momentum equals force times time. When an object of mass m traveling at velocity v comes to a stop over time t, the average force is mv/t. This calculation is crucial for automotive safety design (crumple zones, airbags), sports equipment (helmets, padding), and structural engineering (seismic design).
Frequently Asked Questions
How is impact force calculated?
Average impact force equals the change in momentum divided by the impact duration: F = mv/t (assuming the object comes to rest). Shorter impact times produce larger forces.
Why do airbags reduce impact force?
Airbags increase the time over which deceleration occurs. Since force = momentum change / time, a longer stopping time means lower average force on the occupant.
What units is impact force measured in?
Impact force is measured in newtons (N). One newton is the force needed to accelerate 1 kg at 1 m/s2.