Conservation
of Momentum
Tuesday, January 14, 2014
Conservation of Momentum– Tuesday, 1/14
 Take
out homework from yesterday
 Pick up warm-up from Physics Bin (3 minutes to
complete)
 Read
the ‘I can statement’ on the side board
 Reminder:
Momentum test on Tuesday, 1/21.
Question 1
Use the words in the word bank to complete the
sentence below (note: you will not use all of the
words).
Word bank: mass, momentum, acceleration, time,
impact, weight, impulse, and force.
In a collision, an object experiences a(n) _______
acting for a certain amount of ______ which is
known as a __________; it serves to change the
__________ of the object.
Question 2
Use the GUESS method to calculate the
momentum of a 2.0 kg brick moving through the
air at 12 m/s.
Question 3
Using the GUESS method calculate the impulse
experienced by a 0.168 kg tennis ball
encountering a force of 126 N that changes its
velocity by 61.8 m/s.
Question 4
Player #32 has an inelastic collision with player
#81. Player #32 has a mass of 100 kg and is
traveling at 3.75 m/s. Player #81 has a mass of 130
kg and is traveling at -4.10 m/s. What is the final
velocity of the players after they collide.
a. Draw a picture of the collision
b. Use the GUESS method to solver for final
velocity.
Question 5
Bob and Sally are playing bumper cars at Disney
World. Bob sees that Sally’s cart has stopped
moving and decides to accelerate his car and
bump her. Bob’s 350 kg car is traveling at 12 m/s
when he hits Sally’s 300 kg car. After the collision
Sally’s car is traveling at 10 m/s. What is the
velocity of Bob’s car after the collision?
a. What type of collision is taking place?
b. Draw a picture of the collision.
c. Use GUESS to calculate the final velocity
of Bob’s car.
Question 6
Train ‘A’ is parked on the track and has a mass of
5000 kg. Train ‘B’ is traveling on the same track as
train ‘A’ and has a mass of 1000 kg. Train ‘B’ is
traveling at 25 m/s when contact is made with
train ‘A’. After the collision train ‘B’ slows to 20 m/s.
what is the velocity of train ‘A’ after the collision?
a. What type of collision has taken place.
b. Draw a picture of the collision.
c. Use the GUESS method to calculate the vf
of train A.
Question 7
A 15 kg medicine ball is thrown at a velocity of
2 m/s to a 60 kg person who is at rest on ice. The
person catches the ball and subsequently slides
with the ball across the ice.
a. What type of collision has taken place.
b. Draw a picture of the collision.
c. Calculate the final velocity the ball/person.