Momentum Notes - AP Physics 1

Momentum 03/10/23
inertia
generally described as object's resistance to motion
-




momentum -



tendency of object...

5 momentum
:

rector units: kg.m/s (no name)
m mass
=




I
*

=
velocity vector mr
=




-- and Ihave same direction
-force is required to change a
body's momentum

-something big/slow can have the same momentum as sat small/fast
(equivalentmomental -> P mt m = =


=




Change in Momentum
1P 1 (m.v) =




1P 1m.
change:
=

m

I 14 Ir
change:
=

m.

both 1P 1m. Ar
change:
=




Impolse allows us to consider the time over which a force is exerted on an object
the force implied, the force
longer a is more



5 Est = 5:FnetAt
Fret At 1E
or
=




units of impulse momentum!! - -




a
larger force acts for a short period of time

a smaller force acts for a
longer period of time


Newton's
original and law =

, Example 5.8kg mass is accelerated from vestto 3.5m/s in 2.55. Find fetfor mass




FAt 14 mAv
=
=

m(vf vi)
=
-




f=



w-vi) (35ms
-om/s)
ON
-


=




Example 1.3
kg ball
coming straight to 75kg player at13m/s [right] who kicks itin

direction 22 ms [left]
opposite at
m/argf ofROON. How long are his
foot - ball in contact?




e↑ itetts
At 0.03795


-
=




Eisle to avoid the




Collisions 03/28/23




it
A b.w
=
= f.St 5 SP
=
=




areas
t


ball force
Example a
2.0kg atrestis acted upon by a thatvaries
my time as shown.

II
FFttE=
find
ma



~0.5.0, 2.0
t




Egg
Area 5 15




- ↑
=




2.5ms
=



Vi =




e