Momentum
mass X velocity
momentum
Pi = 99kg*m/s
Pf = 98kg*m/s
Is momentum conserved?
No
Momentum is not conserved
this type of collision causes 100% of the energy to be transferred from object 1 to object 2
PE
Potential Energy
three words that define "momentum"
"Mass in Motion"
what has more momentum- a 12kg dog running at 6m/s or an 88kg buffalo that is stationary
The 12kg Dog
Pi,1 = 25kg*m/s
Pi,2 = 7kg*m/s
Pf,1 = 7kg*m/s
Pf,2 = 30kg*m/s
Is momentum conserved?
No
Momentum is not conserved
object 1 (m = 2.00kg) is moving at an initial velocity of 10m/s and collides with object 2 (m = 5.50kg). After the collision the two balls stick together and move forward with a single velocity. What type of collision is occurring?
Perfectly Inelastic Collision
A basketball is rolling along frictionless grass at a velocity of 12m/s. If the basketball has a mass of 3kg, what is it's kinetic energy?
216J
DAILY DOUBLE
Write Newton's 2nd law as clearly as possible
An 1100g glass of mountain dew is launched to the left at a speed of 12m/s. what is the momentum?
13.2kg*m/s
Pi = 4kg*m/s
mf = 1kg
vf = ??
vf = 4m/s
if object 1 and object 2 collide and bounce off one another and 70% of the energy is transferred from object 1 into object 2, what type of collision is occuring?
Inelastic Collision
If the basketball (m = 3kg) is measured to have a kinetic energy of 500J, how fast is it moving?
18.3m/s
A marble (m = 15g) is rolling along a frictionless surface at an initial speed of 7m/s to the right. It runs into a chewed piece of gum (m = 35g) and the gum sticks to the marble. If the marble continues to roll to the right and momentum is conserved, what type of collision is occurring here?
Perfectly Inelastic Collision
A golf ball (m = 0.20kg), initially at rest, is struck and travels with a velocity of 100m/s. What is the change in momentum of the golf ball during the hit?
+20kg*m/s
mi,1 = 10kg
vi,1 = 1.3m/s
mf,1 = ??
vf,1 = 1m/s
mf,1 = 13kg
DAILY DOUBLE
What kind of system must be present for momentum to be conserved during a collision?
A basketball (m = 3kg) is rolling along frictionless grass at a velocity of 12m/s. If there is a hill that is 700cm tall, will the ball be able to roll all the way up the frictionless hill?
Yes
Pinitial = Pfinal
(What law does this represent?)
Conservation of Momentum
A marble (m = 15g) is rolling along a frictionless surface at an initial speed of 7m/s to the right. It runs into a chewed piece of gum (m = 35g) and the gum sticks to the marble. If the marble continues to roll to the right and momentum is conserved, what will the final velocity of the marble + gum be?
2.1m/s to the right
mi,1 = 10kg mi,2 = 7kg
vi,1 = 4m/s vi,2 = 1m/s
mf,1 = 10kg mf,2 = 7kg
vf,1 = ?? vf,2 = 6m/s
vf,1 = 0.5m/s
Ball 1 has a velocity of 2m/s. Ball 2 has a velocity of -2m/s. If the mass of ball 1 is equal to the mass of ball 2 and they have a perfectly inelastic collision, then what is the final velocity of ball 2?
0m/s
A basketball (m = 3kg) is rolling along frictionless grass at a velocity of 20m/s. Assuming there is a complete transfer of energy from kinetic to potential, what is the tallest hill that the basketball will be able to roll to the top of?
A 20.4m hill
An object with a mass of 1kg is initially 99cm off the ground. If its potential energy is completely transferred into kinetic energy, what is the maximum velocity of the object as it falls?
4.40m/s down