Momentum Flashcards
What is momentum?
Mass in motion
Vector quantity
Units are kg*m/s
Momentum formula
p=mv
What is impulse?
a force must act on an object for a time in order to change its velocity
Impulse momentum theorem
Change in momentum
Units of impulse
N*s
What kind of quantity is impulse?
Vector quantity
If speed stays the same…
whether little/big force or little/large amount of time is applied, momentum is the same
Force is less if…
contact time is longer
Real world applications?
airbags
padded dashboards
Boxer’s riding the punch
Baseball and tennis players following through
Area under the F vs t graph is…
Impulse
How to find impulse on a graph?
area of a rectangle (bh) and area of a triangle (1/2*bh)
What can Fnet (impulse) * time be represented by?
ΔP
Ns is equal to what other unit?
Kg* m/s
Change in momentum
Mvf-mvi
Laws of conservation of momentum?
The momentum of any closed, isolated system does not change
No external forces act on the system
Elastic collisions
Both energy and momentum are conserved
EX: pool balls bounce back perfectly
Inelastic collisions
Only momentum is conserved
Energy is changed to some other form
Fundamental law of physics
P1i +P2i= P1f+P2f
AKA
Pbefore= Pafter
Fundamental law of physics
P1i+P2i= P1f+P2f
a.k.a
Pbefore=Pafter
Elastic collisions
both energy and momentum are conserved
EX: pool balls will bounce back perfectly
Ineleastic collisions
only momentum is conserved
energy is changed to some other form
