momentum Flashcards
what does the principle of conservation of momentum state
total momentum before a collision = total momentum after a collision
momentum equation
mass x velocity
the momentum of n object depends on what
its direction of travel (because velocity is a vector)
when is momentum positive
if its moving forwards
when is momentum negative
when object moves backwards
The momentum of an object will change if: (3)
it’s velocity increases or decreases (acceleration)
it’s direction changes (acceleration)
it’s mass changes
The shorter the time over which momentum changes, the bigger or smaller the force ?
Bigger
time and force are
inversely proportional
the impulse of a collision is equal to
the change in momentum
the change in momentum equation
momentum after - momentum before
impulse of a collision equation
force x change in time
the higher the impact force the __ the change in momentum
bigger
how does an airbag work
- it absorbs energy on impact by changing shape
- to increase impact time of force
- meaning it increases the time it takes for the vehicle to change momentum, and come to a rest
- this reduces the force, and injury
3 saftey features of a car
crumple zone
seatbelt
airbag
all safety features do what
increase impact time and decrease force
