Physics Quiz - Conservation of Momentum

conservation

if a quantity is conserved the total amout of that quantity stays the same

the law of conservation of momentum

in a closed, isolated system the total momentum stays the same

system

a collection of objects

closed system

no objects enter or leave

isolated system

no object from outside the system puts a net force on an object in the system

examples of NOT isolated systems

freefall, inclines, a lot friction, applied force

elastic collision

objects bounce off each other

inelastis collision

objects stick together after the collision

recolil/explosion collision

objects start together and separate due to an internal force

how to talk about conservation of momentum concuptually

change in momentum _b= - change in momentum _a

how to talk about conservation of momentum for calculation

p_total=p’_total (total p stays the same)

what needs to happen for a positive change in momentum

gain positive momentum, lose negative momentum, both

what needs to happen for a negative change in momentum

gain negative momentum, lose positive momentum, both

you need one from positive change in momentum and one from negative change in momentum to do what?

you need one from positive change in momentum and one from negative change in momentum to use equal but opposite changes in mometum to explain conservation

for p-cons, what do subscripts do?

subscripts denote which object

for p-cons, what does an apostrophe do?

apostrphes is used to denote “later”