Momentum
Conservation and Change in Momentum
Perfectly Inelastic Collisions
Elastic Collisions
Misc.
100
What two quantities must you have to determine momentum?
Mass and Velocity
100
What is change in momentum equal to?
Impulse
100
What happens to both objects in a perfectly inelastic collision?
The combine and stay together after the collision.
100
Is kinetic energy conserved in elastic collisions?
For the collision as whole = yes For each object individually = no
100
Name two marsupials
Wallaby kangaroo Koala wombat
200
A cannon fires a cannonball. Describe what happens to the cannon.
The cannon will move backwards with the same momentum the cannonball has moving forward.
200
Explain how a launching rocket conserves momentum if it starts from rest.
The rocket moves up with a positive momentum and the fuel/explosion moves down with an equal but negative momentum. They cancel each other out and equal zero which is the momentum the rocket started with.
200
Consider a perfectly inelastic collision between two cars of equal size traveling at the same speed. Which vehicle has a greater change in kinetic energy as a result of the collision?
They have the same change in kinetic energy
200
In a collision between two soccer balls, momentum is conserved. Is momentum conserved for each soccer ball? Explain.
Each soccer ball has a different momentum before and after a collision because their speed changes.
200
This is the universal solvent's molecular formula
What is H20
300
Object 1 moves with a speed of 32 m/s and Object 2 moves with a speed of 22 m/s. Which object has more momentum?
Neither, you need to know the mass of both objects to determine momentum.
300
Explain why an egg landing on a plate will break, but an egg landing on a pillow stays intact.
The egg breaks on a plate because it has a large force acting over a small time. This causes a very small change in momentum, which means the egg is harder to stop (more momentum with the egg hits the ground). The egg doesn't break on a pillow because it has a large force acting over a larger amount of time. This causes a large change in momentum, which means the egg is easier to stop (less momentum when the egg hits the ground).
300
An 88 kg fullback moving east with a speed of 5.0 m/s is tackled by a 97 kg opponent running west at 3.0 m/s, and the collision is perfectly inelastic. Calculate the velocity of the players just after the tackle and the decrease in kinetic energy during the collision.
V = .81 m/s KE = -1476.6 J
300
A student hits a .4 kg white billiard ball giving it an initial speed of 5 m/s. It hits a blue billiard ball with the same mass initially at rest. Afterwards, the blue billiard ball is traveling 5 m/s. What is the final speed of the white billiard ball?
0 m/s; it is at rest.
300
What does Lu Kang turn into, when fighting shao kahn in the second Mortal Kombat movie
A dragon
400
Find the velocity of a 32 kg object with a momentum of 116 kgm/s.
3.63 m/s
400
A rubber ball with a mass of .48 kg is dropped onto a steel plate. The ball's velocity just before impact is 3.8 m/s and just after impact is 3.4 m/s. What is the change in the ball's momentum?
3.46 kgm/s
400
A swimmer with a mass of 62 kg dives off a raft with a mass of 350 kg. If the swimmer's speed is 3.7 m/s immediately after leaving the raft, what is the speed of the raft?
V = -.66 m/s
400
Each croquet ball in a set has a mass of .45 kg. The green ball travels at 8.9 m/s and strikes a stationary red ball. If the green ball stops moving, what is the final speed of the red ball after the collision?
8.9 m/s
400
Who invented the model that the modern telescope is made off of?
Newton
500
What velocity must a 1540 kg car have in order to have the same momentum as a 2370 kg truck witha velocity of 15 m/s to the east?
V = 23.1 m/s
500
A football punter accelerates a .55 kg football from rest to a speed of 8.0 m/s in .25 s. What constant force does the punter exert on the ball?
F = 1.6 N
500
Two snowballs with a mass of .35 kg and .48 kg respectively, collide head-on and combine to form a single snowball. The initial speed for each is 13 m/s. If the velocity of the snowball with a .83 kg mass is 5 m/s after the collision, what is the decrease in kinetic energy?
-59.76J
500
A bowling ball with a mass of 4 kg strikes a pin with a mass of 1.8 kg. The pin flies forward with a velocity of 4 m/s, and the ball continues forward at 3 m/s. What was the original velocity of the ball?
4.8 m/s
500
a tennis player places a 55 kg ball machine on a frictionless surface. The machine fires a .05 kg tennis ball horizontally with a velocity of 36 m/s toward the north. What is the final velocity of the machine?
-.03 m/s South
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