Summary Momentum & Impulse

MOMENTUM + IMPULSE

MOMENTUM:

Linear product of of
momentum (p) is the the mass and
velocity an
object
P= o v


direction
unit:
kg.m.5" +




CHANGE IN MOMENTUM:


momentum(up) final
change in is the difference between the and the initial momentum of the
object

Op=mv-mu
unit:
kgm.s" direction


IMPULSE:

Impulse (J) is the product of the net force and contact time

J =
Fret Ot OR 5 =
Up: mv-my


Unit: N.S"+ direction unit:
kg.m.s"+ direction

NEWTON'S SECOND LAW IN MOMENTUM FORM:

The net force to the of of momentum
acting on a n
object is
equal rate
change
Fret Ot =
mv-mu




LAW OF CONSERVATION OF LINEAR MOMENTUM:

The total linear momentum of an isolated remains constant
system


ELASTIC vs INELASTIC COLLISIONS:

elastic collision collision where both momentum kinetic conserved
is
energy
a and are


inelastic collision is conserved
a collision where
only momentum is




TIPS TO CALC:

·P/cp/31F It is asked

-
choose direction as +
-
write it down


-calc. w) equations
-
direction!!

-

Fret: Watt -
not isolated
system
in
bullets guns
p is conserved mass changed
·
-



-

falling on/off trolley
-
choose direction
as +, write down
Spring btwn blocks released

-
FOLLOW FORMAT:

Before collision: After collision:
bullet in
gun,



S miE (
M, = m, I missile in cannon
bomb exploding
2, =
VI
=
released
#
=
Mz= me Still before collision
:4 = 8
42 NB-signs!!
= =
vz Uz = 0




Sip before =
Sp after

MM, U, +Mecle M.U,
=

toeVz cr, + 2 V)