Momentum
Ms. Norris
Highland High School
Physical Science
Fall 2016
• A property of all moving objects.
• Which is going to have a harder time stopping?
• Calculated by multiplying an objects mass and
velocity. P=mv
What are the units?
• ALWAYS expressed in kg * m/s
Momentum increases as mass and
velocity increase
• PROPORTIONAL RELATIONSHIP
• For a given velocity, the greater the mass of the
object, the greater the momentum of the object.
• The faster an object is moving the greater the
momentum. If an object is not moving then the
momentum is 0.
• Example:
– When does a car have more momentum, traveling at
30km/hr or at 90km/hr?
– 90km.hr
Force is related to change in
momentum
• Example of catching a baseball
– When you force an object to change it’s motion,
you force it to change their momentum.
– Increasing the time of travel causes the ball to put
less force on your hand.
PULLING THE GLOVE BACK
DURING THE CARTCH INCREASES
THE TIME OF THE MOMENTUMS
CHANGE!
Answers to practice questions page 415
1. P=mv
a)
b)
c)
d)
1200 kg*m/s forward
2190 kg*m/s north
360 kg*m/s eastward
0 kg*m/s forward
2. V=p/m 6m/s forward
Conservation of Momentum
• The total amount of momentum in an isolated
system is conserved.
– The total momentum of two or more objects after
a collision is the same as it was before the
collision.
“NEWTONS CRADLE” – ONE
BALL PICKED OUT, ONE FLIES
OUT THE OTHER SIDE. TWO
BALLS PICKED UP, TWO FLY
OUT THE OTHER SIDE.
Helpful Video links
• https://www.youtube.com/watch?v=4IYDb6K5UF8
– Conservation of momentum in space
• https://www.youtube.com/watch?v=2E9fY8H6O1g
– Conservation of momentum using Newton’s Cradle
– **Support your notes with EVIDENCE from the video.
• Ie, when he draws it, you draw it!
Now Complete the Section 3 Review
• Page 417 #1-4
– You MUST write the question and the answer in
you LNB