Matric IEB Physics Notes: Momentum, Impulse, Work, Energy and Power

, Momentum
Linear momentum
Mass kg
lower case
* SAGS

The product of mass and
velocity of the object p
=
mV
velocity m . st


+ the amount of movement
Momentum +
Unit :
kg object
Ky
·
of
. m . s an
. m . s
Momentum influenced
is
and by object
the
velocity of
mass an




Momentum vector direction will be the
is
quantity the
always that the
velocity
·
a same as as
,


vector


Momentum
Change in



Momentum
changes when the
velocity of the object changes .


final momentum


=
p pf
-


pi initial momentum


=
MVf-mri

k
=
in Uf-vi or m V-u * A not force causes an
object's movement, and
=
m



Therefore also
mV its momentum to
change
=
, .




direction.
g
.
e .
A
hockey ball is
moving at 10m st. in an
casterly It is hit and now

travels at 12 St m . in
original direction It .
the mass of the ball is 0
, 3
kg ,
calculate the
change in

momentum of the ball. p
=
mv

=
-
+ mv -
u

= 0, 312-10

s cast
,6
0
hg
=
. m.




Newton x Momentum
↑




when I not force
p only changes changes . A non-zero is exerted to
change V
.


Net force causes v and therefore causes
p as well


Ethe Net force
net force
acting on an object is
equal ** the rate of
change in momentumis
mass




Fret =
ma
acceleration


n

=
v
- u
a =
+
·
Fret


Fret =
I