Answers350CR Integrated ScienceUnit Test

Unit Test — Unit test Answers

0 verified answers2 views
1
Free Preview

The free-body diagrams of four objects are shown.

Question illustration
A
W
B
X
C
Y
D
Z
2
Free Preview

Newton’s third law of motion says that for every action there is a(n) and opposite reaction.

Answer not available
3

A sports car and a minivan run out of gas and are pushed to the side of the road. Which is easier to push, and why?

A
the minivan, because it has more mass and therefore more inertia
B
the minivan, because it has less mass and therefore less inertia
C
the sports car, because it has more mass and therefore more inertia
D
the sports car, because it has less mass and therefore less inertia
4

According to Newton’s first law of motion, what will an object in motion do when no external force acts on it?

A
come to a stop
B
move at the same velocity
C
speed up
D
change direction
5

The gravitational acceleration on Earth is 9.8 m/s2. What is the weight of a car on Earth (to the nearest whole number) if it has a mass of 1360 kg?

A
14 N
B
139 N
C
1333 N
D
13,328 N
6

Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences?

A
It is less than the acceleration of the backpack because she has a greater mass.
B
It is greater than the acceleration of the backpack because she has a greater mass.
C
It is less than the acceleration of the backpack because she uses a smaller force.
D
It is greater than the acceleration of the backpack because she uses a larger force.
7

Students are completing a lab in which they let a lab cart roll down a ramp. The students record the mass of the cart, the height of the ramp, and the velocity at the bottom of the ramp. The students then calculate the momentum of the cart at the bottom of the ramp.Which trial’s cart has the greatest momentum at the bottom of the ramp?

Question illustration
A
trial 1, because this trial has the greatest velocity
B
trial 2, because this trial has the greatest ramp height
C
trial 3, because this trial has a large mass and a large velocity
D
trial 4, because this trial has the greatest mass
8

[BLANK]

A
force
B
impulse
C
momentum
D
velocity
9

An object pulled to the right by two forces has an acceleration of 2.5 m/s2. The free-body diagram shows the forces acting on the object.

Question illustration
A
50 N
B
98 N
C
313 N
D
490 N
10

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. When the carts collide, they hook together. Assume that positive momentum is to the right.Which graph best represents the momentum of both carts over time, before and after the collision?

Question illustration
A
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 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
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 D
11

A rocket experiences a constant force even as the amount of fuel in its fuel tanks decreases. What happens to the acceleration of the rocket as it runs out of fuel?

A
The acceleration decreases because the mass increases.
B
The acceleration increases because the mass increases.
C
The acceleration decreases because the mass decreases.
D
The acceleration increases because the mass decreases.
12

A ball is dropped from the top of a building. It initially moves at 4.0 m/s. After 0.5 seconds, it moves at 3.8 m/s.

A
air resistance
B
gravity
C
normal
D
tension
13

A box is sitting on the floor. The box was then pulled with a force, Ft. The box did not move. The free-body diagram of the box is shown.

Question illustration
A
It is moving up with a net force of 20 N.
B
It is moving to the right with a net force of 10 N.
C
It is in dynamic equilibrium with a net force of 0 N.
D
It is in static equilibrium with a net force of 0 N.
14

[BLANK]

A
20
B
45
C
50
D
75
15

What is the mass of an object if a net force of 8.0 N causes it to accelerate at 1.1 m/s2?

A
6.9 kg
B
7.3 kg
C
8.8 kg
D
9.1 kg
16

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
17

A 0.25 kg baseball is in contact with a bat for 0.0075 s and exerts a force of 18,500 N. What impulse is delivered to the ball?

A
33 kg •
Option A
B
140 kg •
Option B
C
4600 kg •
Option C
D
74,000 kg •
Option D
18

A box is at rest on a ramp at an incline of 22°. The normal force on the box is 538 N.

A
202 N
B
217 N
C
499 N
D
580 N
19

Which object is in static equilibrium?

A
a rolling ball that has a net force acting on it
B
a cruising car that has no net force acting on it
C
a book that has no net force acting on it and is sitting on a table
D
a vase that has a net force acting on it and is sitting on a shelf
20

Two blocks are initially at rest with a compressed spring between them. When the spring is released, the 2m block moves to the left and the m block moves to the right. This represents an inelastic collision in a closed system.

Question illustration
A
The total energy is zero.
B
The total momentum is zero.
C
The momentum of the m block is zero.
D
The momentum of the 2m block is zero.

Did you find these answers helpful?

More from this Course

Quiz
1 verified answers

Unit Test

Assignment
19 verified answers

Lesson 4: Projectile Motion

Quiz
17 verified answers

Work and Power