Answers2003390-Physics 1 Honors Sem. 1 - PetersImpulse and Momentum

Lab: Conservation of Linear Momentum Answers

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1
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An empty 2,500 kg train car is headed northbound at a velocity of 5 m/s. Ahead of the first car, an empty 1,500 kg car is headed northbound on the same track at 1 m/s. The faster train bumps into the slower one, and they combine into one train.What is the velocity of the two-car train?

A
1 m/s
B
3 m/s
C
3.5 m/s
D
5 m/s
2
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In a lab, two identical lab carts (m = 1.0 kg) travel toward each other, each with a speed of 2 m/s. The cars collide, and one cart moves to the right with a speed of 3 m/s and the other moves left with a speed of 2 m/s.

A
This experiment did not occur in a closed system.
B
This proves the conservation of momentum since pi = pf .
C
An additional mass was added to one cart, which explains the increase in speed.
D
The increase in speed was due to the kinetic energy from one cart transferring to the other.
3

forceimpulsemomentumvelocity

A
force
B
impulse
C
momentum
D
velocity
4

A bowling ball has an initial momentum of +30 kg m/s and hits a stationary bowling pin. After the collision, the bowling ball leaves with a momentum of +13 kg • m/s.

A
0 kg • m/s
B
11 kg • m/s
C
17 kg • m/s
D
43 kg • m/s
5

Which are examples of perfectly inelastic collisions? Check all that apply.a baseball bouncing off a bat bumper cars bumping off of each othera cue ball hitting an eight ball and stoppinga plane landing on an aircraft carrierrain sticking to a windowtwo train cars coupling together

A
a baseball bouncing off a bat
B
bumper cars bumping off of each other
C
a cue ball hitting an eight ball and stopping
D
a plane landing on an aircraft carrier
E
rain sticking to a window
F
two train cars coupling together
6

A large blue marble of mass 3.5 g is moving to the right with a velocity of 15 cm/s. The large marble hits a small red marble of mass 1.2 g that is moving to the right with a velocity of 3.5 cm/s. After the collision, the blue marble moves to the right with a velocity of 5.5 cm/s.

A
9.2 cm/s
B
14 cm/s
C
24 cm/s
D
31 cm/s
7

A ball has a mass of 0.25 kg and is moving to the right at 1.0 m/s. It hits a ball of mass 0.15 kg that is initially at rest. After the collision, the 0.15 kg ball moves off to the right with a velocity of 0.75 m/s.

A
0.42 m/s to the right
B
0.42 m/s to the left
C
0.55 m/s to the right
D
0.55 m/s to the left
8

Which equation best describes the law of conservation of momentum?

A
pi = pf
B
pi > pf
C
pi < pf
D
pi + pf = 0
9

Two identical carts travel at the same speed toward each other, and then a collision occurs. The graphs show the momentum of each cart as a function of time, both before and after the collision.Which graph shows a perfectly inelastic collision?

A
There is a graph with time in seconds on the x axis and the y axis is labeled P in kilogram meters per second. There is a red horizontal line that drops down below the x axis and is the farther away from the x axis and a horizontal line. A blue line is the mirror image starting below the x axis and ending above the x axis. The red line is labeled car A and a blue line labeled car B. At the point both graphs cross the x axis is labeled collision.
Option A
B
A graph with momentum on the y axis measured in kilogram meters per second and time on the x axis measured in seconds. There are no values on the axes. There are two curves on the graph. The first starts above the x axis and is horizontal before curving downward to the x axis labeled 2 m cart. The second curve starts below the axis, the same distance below as the first one was above, and is horizontal before curving upward toward the x axis at the same time and labeled m cart. Where they meet is labeled Collision. Both curves meet at the x axis at the same time and are both on the x axis for a time period labeled Combined carts.
Option B
C
A graph with momentum on the y axis measured in kilogram meters per second and time on the x axis measured in seconds. There are no values on the axes. There are two curves on the graph the first starts above the x axis and is horizontal before curving downward toward the x axis labeled 2 m cart. The second curve starts below the axis, a smaller distance below as the first one was above, and is horizontal before curving upward toward and crosses the x axis and is labeled m cart. Where they meet is labeled Collision. Both curves meet above the axis at the same time and both go horizontal above the x axis for a time period labeled Combined carts.
Option C
D
There is a graph with time in seconds on the x axis and the y axis is labeled P in kilogram meters per second. There is a red horizontal line that drops down below the x axis and is then farther away from the x axis and a horizontal line. A blue line is the mirror image starting below the x axis and ending above the x axis. The red line is labeled car A and a blue line labeled car B. At the point both graphs cross the x axis is labeled collision.
Option D
10

A basketball player passes a ball to a teammate at a velocity of 6 m/s. The ball has a mass of 0.51 kg. If the original player has a mass of 59 kg and there is no net force on the system, what is the velocity of the player after releasing the ball? Let a positive velocity be in the direction of the pass.

A
–0.05 m/s
B
–0.5 m/s
C
–0.6 m/s
D
–6 m/s

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