Transcript Momentum Problems Always use the formula p = m x v p= momentum m = mass v = velocity.

Momentum Problems
Always use the formula p = m x v
p= momentum
m = mass
v = velocity
Example

A fly hit a windshield with a velocity of
15 m/s. The fly had a mass of .0025 kg.
How much momentum did the fly have
when it hit the windshield?
Quic kT ime™ and a
T IFF (Uncompres sed) decompres sor
are needed to s ee this picture.
Solving
p=mxv
p = .0025 kg x 15 m/s
P = .0375
BUT….
What about the units???
m is measured in kg
 v is measured in m/s
 SO…. P is measured in kg • m/s


The dot is for the multiplication sign!!!
Final Answer

0.0375 kg • m/s
Another Example

You were exploring in a jungle on your
vacation to Africa. You hear a roar
close by. You jump out of your skin and
start running. You slam into a rhino with
a velocity of 60 m/s. Your mass is 52
kg. What was your momentum when
you hit the rhino?
Answer
QuickTime™ and a
TIFF(Uncompressed) decompressor
are needed to see thi s picture.

52 kg x 60 m/s

3120 kg • m/s
WOWZERS!!!
On Your Own!!!

Your little brother was forced to eat
peas at dinner. He can’t stand the taste
of them. When your parents weren’t
looking he spit the pea out at a velocity
of 23 m/s. The mass of the pea is
.000142 kg. What was the momentum
of the pea when it hit your head?
Answer


.000142 kg x 23 m/s
.003266 kg • m/s
Qui ckT ime™ and a
T IFF (Uncompres sed) dec ompres sor
are needed to s ee this pic ture.