AnswersPhysicsOne-Dimensional Motion and Forces

One-Dimensional Motion and Forces — Test Answers

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1
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At which time does Object Z pass Object Y?

A
2
B
3
C
4
D
5
2
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Which trial has the greatest impulse?

A
trial 1
B
trial 2
C
trial 3
D
trial 4
3

Which object has a net force of negative 5 cap n down?

A
cap w
B
cap x
C
cap y
D
cap z
4

How can the map be changed so it shows constant acceleration after the object changes direction?

A
by adding vectors that are all the same length and placing them below the current bottom row of vectors
B
by adding vectors that gradually increase in length and placing them above the current top row of vectors
C
by adding vectors that are all the same length and placing them above the current top row of vectors
D
by adding vectors that gradually increase in length and placing them below the current bottom row of vectors
5

A box is being pulled to the right. What is the direction of the gravitational force?

A
left
B
right
C
up
D
down
6

Which is an example of speed?

A
Leo lives 2 miles north of Andre.
B
A dog runs an average of 8 mph .
C
Cindy biked westward at 30 kilometers per hour .
D
A rock is to the left of a flowerpot.
7

Which characteristic does an object with a constant acceleration always have?

A
changing velocity
B
fast speed
C
slow speed
D
constant velocity
8

A 225 kilograms red bumper car is moving at 3.0 meters per second It hits a stationary 180 kilograms blue bumper car. The red and blue bumper cars combine and hit a stationary green bumper car of mass 150 kilograms The red, blue, and green bumper cars all combine. What is the final velocity of the combined bumper cars?

A
1.7 meters per second
B
2.7 meters per second
C
0.93 meters per second
D
1.2 meters per second
9

Which formulas show the relationships between momentum, mass, and velocity? Choose three correct answers.

A
p is equal to m v
B
m is equal to p over v
C
v is equal to p over m
D
p is equal to v over m
E
p is equal to v over p
F
p is equal to m over v
G
v is equal to m over p
10

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 less mass and therefore less inertia
B
the minivan, because it has more mass and therefore more inertia
C
the sports car, because it has less mass and therefore less inertia
D
the sports car, because it has more mass and therefore more inertia
11

A baseball has a mass of 0 point 4 5 kilograms and is thrown with a speed of 25 meters per second What is the momentum of the baseball?

A
140 kilograms times m over s
B
0 point 0 1 8 kilograms times m over s
C
11 kilograms times m over s
D
56 kilograms times m over s
12

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 sports car, because it has more mass and therefore more inertia
C
the minivan, because it has less mass and therefore less inertia
D
the sports car, because it has less mass and therefore less inertia
13

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 greater than the acceleration of the backpack because she uses a larger force.
B
It is less than the acceleration of the backpack because she uses a smaller force.
C
It is less than the acceleration of the backpack because she has a greater mass.
D
It is greater than the acceleration of the backpack because she has a greater mass.
14

A box is being pulled to the right. What is the direction of the gravitational force?

A
down
B
right
C
up
D
left
15

A ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball?

A
the force of gravity
B
the force of tension
C
the pushing force
D
the normal force
16

Two grocery carts have the same initial total momentum. The two carts collide, and now cart B has a greater final velocity. Which best describes the final total momentum of both the carts compared to the initial total momentum?

A
It is greater if cart B has a greater mass.
B
It is the same if no external forces are added.
C
It depends on the masses of cart A and cart B.
D
It is less if cart B has a smaller mass.
17

Which graph best represents the momentum of both carts over time, before and after the collision?

A
Image with description 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.
B
Image with description 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.
C
Image with description 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.
D
Image with description 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.
18

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

A
change direction
B
come to a stop
C
move at the same velocity
D
speed up
19

What best describes the blocks after the spring is released?

A
The momentum of the m block is zero.
B
The total energy is zero.
C
The total momentum is zero.
D
The momentum of the 2 m block is zero.
20

Which best describes the friction acting on the piano?

A
The static frictional force is greater than the kinetic frictional force, so the static frictional force is greater than 1200 N.
B
The static and kinetic frictional forces are equal, so the static frictional force is equal to 1200 N.
C
The kinetic frictional force is greater than the static frictional force, so the kinetic frictional force is greater than 1200 N.
D
The static and kinetic friction are both equal to the gravitational force of 2200 N.

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