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

Impulse and Momentum — Unit test Answers

24 verified answers
1
Free Preview

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
2
Free Preview

Students perform an experiment in which they drop two eggs with equal mass from a balcony. In the first trial, the egg hits the ground and breaks. In the second trial, the egg hits a foam cushion and does not break or bounce.

A
The impulse was greater in the first experiment because the egg broke.
B
The impulse was greater in the second experiment because the egg did not break.
C
The impulse was the same in both experiments because the egg came to a stop.
D
The impulse cannot be determined without the mass and velocity of the eggs.
3

An object with a mass of 1.5 kg changes its velocity from +15 m/s to +22 m/s during a time interval of 3.5 seconds. What impulse was delivered to the object?

A
3.0 N • s
B
11 N • s
C
25 N • s
D
56 N • s
4

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
5

Which equation best describes the law of conservation of momentum?

A
pi = pf
B
pi > pf
C
pi < pf
D
pi + pf = 0
6

Different forces were applied to five balls, and each force was applied for the same amount of time. The data is in the table.

Question illustration
A
It divides in half.
B
It does not change.
C
It doubles.
D
It quadruples.
7

What are possible formulas for impulse? Check all that apply.J = FtJ = J = FvJ = J = mvJ = p

Question illustration
A
J = Ft
Option A
B
J =
Option B
C
J = Fv
Option C
D
J =
Option D
E
J = mv
Option E
F
J = p
Option F
8

A rubber bullet of mass m is fired from a rifle into a stationary block of 25 m. The bullet remains in the block and both the bullet and the block move off with a common velocity. Assume this is an inelastic collision in a closed system.

A
The final momentum of the bullet/block is zero.
B
The final momentum of the bullet/block is equal to the initial momentum of the bullet.
C
The final momentum of the bullet/block is less than the initial momentum of the bullet.
D
The final momentum of the bullet/block is more than the initial momentum of the bullet.
9

Which formulas show the relationships between momentum, mass, and velocity? Check all that apply.p = mvp = p = m = p = v = v =

Question illustration
A
p = mv
B
p =
Option B
C
p =
Option C
D
m =
Option D
E
p =
Option E
F
v =
Option F
G
v =
Option G
10

Which cars have the same magnitude of momentum? Check all that apply.

A
car 1
B
car 2
C
car 3
D
car 4
E
car 5
11

Momentum data about the same objects in the same closed system is shown below.

Question illustration
A
3.4
B
3.5
C
3.6
D
3.7
12

A 0.060 kg ball hits the ground with a speed of –32 m/s. The ball is in contact with the ground for 45 milliseconds and the ground exerts a +55 N force on the ball.

A
9.3 m/s
B
12 m/s
C
41 m/s
D
73 m/s
13

A girl is standing still in the middle of a baseball field. The girl catches the baseball and begins to move in the same direction as the thrown ball.

A
inelastic, since the girl moves in the same direction as the thrown ball
B
inelastic, since the girl moves in the opposite direction of the thrown ball
C
elastic, since the girl moves in the same direction as the thrown ball
D
elastic, since the girl moves in the opposite direction of the thrown ball
14

A 35-gram stainless steel ball on a track is moving at a velocity of 9 m/s. On the same track, a 75-gram stainless steel ball is moving at a velocity of –7 m/s. After colliding, the 35-gram ball moves at a velocity of –15 m/s. Assume there is no net force on the system.What is the velocity of the 75-gram ball after the collision? Round to the nearest tenth.

A
–4.2 m/s
B
–0.5 m/s
C
0.5 m/s
D
4.2 m/s
15

What type of relationship exists between momentum and mass?

A
direct
B
inverse
C
logarithmic
D
quadratic
16

2.24.48.813

A
2.2
B
4.4
C
8.8
D
13
17

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
18

A train car has a mass of 10,000 kg and is moving at +3.0 m/s. It strikes an identical train car that is at rest. The train cars combine.

A
0 m/s
B
1.5 m/s
C
3.0 m/s
D
6.0 m/s
19

Two grocery carts have the same initial total momentum. The two carts collide, and now cart B has a greater final velocity.

A
It is less if cart B has a smaller mass.
B
It is greater if cart B has a greater mass.
C
It is the same if no external forces are added.
D
It depends on the masses of cart A and cart B.
20

For a movie stunt, an empty truck with a mass of 2000 kg goes 10 m/s and runs into a stopped car of mass 1000 kg. The truck then keeps moving and pushes the car along with it.

A
The collision is perfectly elastic.
B
Kinetic energy stays the same.
C
The momentum after the collision is greater than the momentum before the collision.
D
The speed of the combined vehicles is less than the initial speed of the truck.

Did you find these answers helpful?

More from this Course

Quiz
23 verified answers

Work and Power

Quiz
10 verified answers

Impulse and Momentum

Quiz
10 verified answers

Lab: Conservation of Linear Momentum

Impulse and Momentum — Unit test Answers —…