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what causes a change in momentum?
a force acting on an object
what is the equation for force in terms of momentum?
force = change in momentum ÷ time
how does force relate to change in momentum?
a larger force causes a faster change in momentum
why are car safety features designed to slow down crashes?
increasing the time taken to stop reduces the force, lowering the risk of injury
how do crumple zones help in a crash?
they absorb impact by increasing the time taken for the car to stop
how do seat belts reduce injury?
they stretch slightly to increase stopping time, reducing force on the body
how do airbags protect passengers?
they inflate and compress to slow down impact more gradually
how do bike helmets reduce head injuries?
they contain a foam layer that increases stopping time, reducing impact on the brain
why are crash mats and soft playground surfaces safer?
they are made of soft, compressible materials that increase stopping time, reducing force
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