chapter 4 momentum Flashcards
law of conservation of momentum
in a closed system, the total momentum before an event is equal to the total momentum after and event
when 2 objects push each other apart, they move:
-with different speeds if the have unequal masses
-with equal and opposite momentum so their total momentum is zero
the longer the impact time…
the more impact force if reduced
when 2 vehicles collide:
-they exert equal and opposite forces on each other
-their total momentum is unchanged
when vehicles collide…
the force of the impact depends on the changes of momentum and the duration of the impact
how do airbags and seatbelts protect passengers?
they spread the force across the chest and increase the impact time
how do side impact bars protect passengers?
they deform in an impact, so increasing the impact time
