A lead brick has a lot of mass
and therefore a lot of inertia.

The greater the mass, the greater the tendency for an object to remain
at rest, the smaller the acceleration that is produced by a given force.

Momentum Word Problems

J = Ft = mΔv = Δp

Ex 1) A 5.0 kg mass has its
velocity change from 8.0 m/s east to 2.0 m/s east.

Find the objects change in momentum.

Ex 1) A
5.0 kg mass has its velocity change from
8.0 m/s east to 2.0 m/s east.
Find the objects change in momentum.

m = 5.0 kg
V_{i} = 8.0 m/s East
V_{f} = 2.0 m/s East
Δp = ?

J = Ft = mΔv =Δp

Δp = mΔV

= (5.0 kg)(2.0 m/s - 8.0 m/s)

= -30. kgm/s East

or +30. kg m/s West

Ex 2) A 5.0 kg mass moving
with a velocity of 8.0 m/s east has an impulse applied to it
which causes its velocity to change to 20. m/s East.
Find Impulse:

Ex 2) A 5.0
kg mass moving with a vector of 8.0 m/s
east has an impulse applied to it which causes its velocity to
change to 20. m/s East.

Find Impulse:

m = 5.0 kg
V_{i} = 8.0 m/s East
V_{f }= 20. m/s East
J = ?

J = Ft = mΔv =Δp

J = mΔv = (5.0 kg)(12. m/s
East)

= 60. kg m/s east

= 60. Ns East

Find the force if the impulse was applied for
3.0 sec.

A teacher pushed ice cubes of
different masses with different amounts of force.
Which diagram shows the cube that will show the
biggest velocity change
when pushed with the force represented by the arrow?

A) A
B) B
C) C
D) D
E) To find the
velocity change, you need the force's contact time.