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[Music] hi and welcome back to three science lessons cold ruk by the end of this video you should be able to calculate the force acting on an object due to the change in momentum you should then be able to describe how safety features such as car seat belts reduce the dangers of changes in momentum and all of this is for triple physics students only over the last couple of videos weve looked at momentum remember that we cant collect momentum by multiplying the mass of an object by its velocity one key idea that you need to understand is that rapid changes in momentum can be extremely dangerous Im sure you hear a crash test car manufacturers use crash tests to design safety features such as seat belts during the car crash the momentum of the passengers falls from a large amount to zero in less than a second this place is huge forces on the passengers and that can be lethal so were going to start by taking a look at the maths involved now this can look a bit tricky but bear with it