7th Grade Chapter 4 Practice

The 62 questions on your test are from this bank. Study hard.
7th Grade - Chapter 4 Test - REVIEW

Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.

____ 1. The speed you read on your speedometer is the constant speed. _________________________

____ 2. When you ride your bike around a corner at 10 m/s, you are accelerating. _________________________

____ 3. To determine if an object has changed position, you need to know it's position relative to another object. _________________________

____ 4. Acceleration is caused by any forces. _________________________

____ 5. An example of a contact force is magnetism. _________________________

____ 6. If an astronaut were to land on Jupiter, his mass would increase. _________________________

____ 7. Sliding friction keeps you in the seat when a car goes around a corner. _________________________

____ 8. Forces always occur alone. _________________________

____ 9. If you throw a ball into the air, Earth exerts a force on the ball. The ball in the air exerts no force. _________________________

____ 10. To locate a mall close to you, you need to know it's distance. _________________________

____ 11. You push on a book and it moves. The forces acting on it must be action-reaction forces. _________________________

____ 12. If an unbalanced force is acting on a rope, the rope will accelerate in the direction of the unbalanced force. _________________________

____ 13. An insect falls from a twenty-story building and walks away when he hits the sidewalk because of contact forces. _________________________

Multiple Choice
Identify the choice that best completes the statement or answers the question.

____ 14. Electric, magnetic, and gravitational forces are all examples of which type of force?
a.
balanced
b.
contact
c.
non-contact
d.
unbalanced


____ 15. Which of the following has a net force of zero?
a.
balanced force
b.
buoyant force
c.
gravitational force
d.
unbalanced force


____ 16. Max is pushing a book across a table. When he stops pushing, the book slows down and stops. This is an example of which force?
a.
air resistance
b.
buoyancy
c.
gravity
d.
sliding friction


____ 17. When does a gravitational force between two objects increase?
a.
when the mass of the objects increases
b.
when the speed of the objects increases
c.
when the mass of the objects decreases
d.
when the speed of the objects decreases


____ 18. Mark is traveling 3 mi north at 2 mph. Which of the following can be figured out with this information?
a.
acceleration
b.
average speed
c.
displacement
d.
velocity


____ 19. Susan made a diagram to show how the relationship between a buoyant force and gravity.


Which answer BEST describes the relationship shown in the diagram?
a.
Buoyancy and gravity together balance an object.
b.
Buoyant forces move at a faster rate than gravity.
c.
Gravity is more powerful than buoyancy.
d.
Objects do not know whether they will be pulled up or down


____ 20. The Average Speed equation states that average speed in meters per second equals distance in meters divided by time in seconds. If Jan travels 63 m in 7 s, what is her average speed?
a.
7 m/s
b.
9 m/s
c.
14 m/s
d.
63 m/s


____ 21. Donna measured the displacement and time for a traveling object.


What is the velocity of the object?
a.
2 km/h south
b.
3 km/h south
c.
4 km/h south
d.
6 km/h south


____ 22. Motion is change in ____.
a.
speed
c.
force
b.
velocity
d.
position


____ 23. ____ is rate of change of position.
a.
Speed
c.
Acceleration
b.
Velocity
d.
Displacement


____ 24. You travel 200 km in 2 h. Your ____ speed is 100 km/h.
a.
constant
c.
instantaneous
b.
average
d.
initial


____ 25. When a car slows down at a traffic light, it is ____.
a.
accelerating
c.
decreasing its displacement
b.
traveling at constant velocity
d.
changing direction


____ 26. The unit of force is ____.
a.
m/s
c.
the joule
b.
the hertz
d.
the newton


____ 27. When two birds are pulling on a worm and the worm moves toward the first bird, you know that the forces are ____.
a.
long-range
c.
unbalanced
b.
action-reaction
d.
balanced


____ 28. A planet is discovered that is the same size as Earth and has the same gravitational acceleration, but has twice the mass. If you weigh 700 N on Earth, on the new planet you would weigh ____.
a.
350 N
c.
1,400 N
b.
700 N
d.
2,800 N


____ 29. Every force has a(n) ____ force.
a.
reaction
c.
opposite
b.
long-range
d.
accelerating


____ 30. An object at rest remains at rest. An object in motion keeps moving in a straight line at a constant speed. Which of Newton’s laws of motion does this describe?
a.
first law
b.
second law
c.
third law
d.
first and third laws together


____ 31. Which law of motion says that the ground pushes back on you when you push down on it?
a.
first law
b.
second law
c.
third law
d.
fourth law


____ 32. When is an object NOT accelerating?
a.
when it changes speed
b.
when it changes direction
c.
when it changes force
d.
when it changes velocity


____ 33. According to Newton’s second law of motion, how is acceleration related to net force?
a.
When net force on an object increases, acceleration increases.
b.
When net force on an object decreases, acceleration increases.
c.
When acceleration changes, net force stays the same.
d.
When net force changes, acceleration stays the same.


____ 34. Which statement best describes Newton’s third law of motion?
a.
All forces are equal.
b.
An object at rest tends to stay at rest.
c.
Forces always act in pairs.
d.
Some forces have no reaction.


____ 35. You hear that a storm is moving 15 km/h north. You have been given the storm's ____.
a.
constant speed
c.
velocity
b.
acceleration
d.
average speed


____ 36. Inertia is a measure of the ____ of an object.
a.
weight
c.
constant speed
b.
mass
d.
acceleration


____ 37. An unbalanced force acting on an object causes it to ____.
a.
move at constant speed
c.
not change its velocity
b.
continue in a straight line
d.
accelerate


____ 38. The force that opposes motion is ____.
a.
a balanced force
c.
an accelerating force
b.
an unbalanced force
d.
friction


____ 39. You throw a ball into the air. As the ball leaves your hand, the force(s) acting on it is/are ____.
a.
gravity
c.
balanced
b.
your hand
d.
gravity and your hand


Completion
Complete each statement.

40. If you walk one mile to a store and one mile back, your distance is ____________________ and your displacement is ____________________.

41. Speeding up, slowing down, and going around curves are examples of ____________________.

42. A(n) ____________________ is a push or a pull.

43. A car going around a corner, hits an icy path, and skids off the road. This represents a change from rolling friction to ____________________ friction.

44. If you ride your bike 2 miles on a straight road between Gooseberry Junction and Happy Valley, your distance is ____________________ and your displacement is ____________________.

45. ____________________ is the change in velocity divided by the change in time.

46. If you are riding on a skateboard and it stops suddenly, your body keeps moving forward. This is because of ____________________.

47. Forces that change an object's motion by touching the object are ____________________ forces.

48. A spacecraft orbits the Earth at a constant speed. The forces acting on it must be ____________________.

49. Acceleration due to gravity at the Earth's surface is ____________________.

50. Wagons have wheels instead of runners because ____________________ friction is less than ____________________ friction.

51. When you catch a ball, the ball creates force on your hand. The reaction force is ____________________.

52. If you throw a ball into the air, at the top of the path the force(s) acting on the ball is/are ____________________.

Choose the term or phrase that best completes each sentence.

53. If you drive from New York to San Francisco by way of Mt. Rushmore, Yellowstone National Park, and Branson, Missouri, your distance traveled is ____________________ (greater than, less than, the same as) your displacement.

54. When your feet push on the floor so that you can walk across the room, you move but the floor doesn’t. The force of the floor on your feet is ____________________ (greater than, less than, the same as) the force of your feet on the floor.

55. Standing still in a windstorm is an example of ____________________ (static, sliding, rolling) friction between your feet and the ground.

56. To push a box across the floor takes more force than to push the same box on wheels across the floor. This shows that rolling friction is ____________________ (greater than, less than, equal to) sliding friction.

57. In order to keep a race car going around a circular track at constant speed, ____________________ (no force, a balanced force, an unbalanced force) is needed.

58. A reaction force is created ____________________ (before, after, at the same time as) its action force.

59. The force needed to accelerate a full-size car to a given velocity is ____________________ (greater than, less than, equal to) the force needed to accelerate a motorcycle to the same velocity.

60. The displacement of a car driving a winding road up a mountain is ____________________ (greater than, less than, the same as) the distance the car travels.

61. When you push off of the side of a swimming pool, the force of your foot on the wall is created ____________________ (before, after, at the same time as) the force of the wall on your foot.

62. When a ball starts to fall through the air, the force of air resistance on the ball is ____________________ (greater than, less than, the same as) the force of gravity.

63. The mass of an astronaut ____________________ (increases, decreases, remains the same) when the astronaut goes on a space walk.

64. A crumpled piece of paper falls to the ground faster than a smooth piece because of ____________________.

65. When you push a book across your desk, the force of your hand is ____________________ the force of static friction.

66. The force needed to accelerate a bowling ball to a given velocity is ____________________ the force needed to accelerate a soccer ball to the same velocity.

67. A radio-controlled plane flies 75 m north, then 95 m south. Its ____________________ is 20 m south.

68. A car that travels 200 km in 2 h has a(n) ____________________ speed of 100 km/h.

69. ____________________ keeps you from sliding backward when you climb a hill.

70. ____________________ is the tendency of a body to resist change in its motion.

71. Forces always occur in equal but opposite ____________________.

Matching

Match each item with the correct description below.
a.
static friction
k.
Unbalanced forces
b.
force
l.
Acceleration
c.
rolling friction
m.
Inertia
d.
displacement
n.
Speed
e.
first law of motion
o.
Second law of motion
f.
Newton’s laws of motion
p.
Friction
g.
Sliding friction
q.
Air resistance
h.
Velocity
r.
Mass
i.
Balanced forces
s.
Newton (N)
j.
Third law of motion
t.
weight


____ 72. the distance and direction between starting and ending positions

____ 73. the distance traveled divided by the time needed to travel the distance

____ 74. change in velocity divided by the amount of time required for the change to occur

____ 75. displacement divided by time

____ 76. an object will remain at rest or move in a straight line with constant speed unless it is acted upon by a force

____ 77. equal forces that move in opposite directions

____ 78. a push or a pull

____ 79. forces that move in opposite directions that are not of equal strength

____ 80. a force that resists motion

____ 81. an object acted upon by an unbalanced force will accelerate in the direction of the force

____ 82. forces always act in equal but opposite pairs

____ 83. Air molecules act on the forward-moving surface of an object, slowing its motion.

____ 84. the friction that occurs when two surfaces slide past each other

____ 85. the friction that hinders a stationary object from moving on a surface when a force is applied to that object

____ 86. a force that can change when acceleration due to gravity changes

____ 87. a measure of the amount of matter in an object

____ 88. measures an object’s tendency to remain at rest or keep moving with constant velocity

____ 89. used to measure force

____ 90. a set of rules used to predict and explain motion

____ 91. The type of friction that makes a tire turn and a ball roll is called ____.

Match the unit with the quantity it measures.
a.
second
d.
m/s2
b.
newton
e.
meter
c.
m/s



____ 92. speed

____ 93. distance

____ 94. force

____ 95. time

____ 96. acceleration

Match Newton’s laws of motion with the examples given.
a.
Newton’s first law
c.
Newton’s third law
b.
Newton’s second law



____ 97. A magician pulls the table cloth off a table, leaving the dishes on the table.

____ 98. A ball rolling across the floor eventually comes to a stop.

____ 99. A rower’s arms push the oars against the water. The boat moves forward after the water pushes against the oars.

____ 100. A rock moves slower when shot out of a slingshot than a pebble shot out of the same slingshot.

____ 101. You jump off a raft in the swimming pool, and when you turn around to get back on the raft, the raft has floated off in the opposite direction.

Short Answer

102.
If you run three laps around a circular race track at 5 m/s, what do you know about your speed, velocity, and acceleration?

103. A high speed train travels south for 2.00 h for a distance of 454 km. What is its average velocity?

104. Calculate the force necessary to accelerate a 0.14-kg hardball at a rate of 100 m/s2.

105. A car travels 528 km in six hours. Find its average speed.

106. Is it possible to have a single force? Explain why or why not.

107. It has been found that when a karate blow of a fist strikes a wooden block, the block can exert a force of 2,450 N on the hand. What force must be put on the block to break it?

108.
Explain the difference between speed and velocity.

109.
Mr. French’s class is using a toy car to study Newton’s laws of motion.

Part A What does Newton’s first law state?

Part B Give an example of how the class can use the toy car to demonstrate how the law works.

110.
Compare and contrast distance and displacement.

111.
Compare and contrast speed and velocity.

112.
Is it necessary for an object to be in motion if it has forces acting on it? Why or why not?

113.
"If no forces are acting on a moving object, it will eventually come to rest." Comment on this statement.

114.
If you were playing football on the space station, would it be as hard to stop a 150-kg lineman as it would be on Earth? Why or why not?

115.
How is force similar to displacement and velocity?

116.
You drop a pebble from a bridge and it goes faster and faster before it hits the water. What do you know about the forces acting on the pebble?

117.
If a body is in motion at constant speed in a straight line, what, if any, forces could be acting on it?

118.
How could you decrease the force a horse needed to pull a wagonload of hay?

119.
For a long time, all experiments showed that a force had to be applied to keep a body in motion at constant velocity. How does our knowledge of the force of friction help us to understand, now, that this isn't true?

Figure 23-1

120.
In Figure 23-1, identify two pairs of action-reaction forces involving the rope.

121.
In Figure 23-1, identify two balanced forces involving the rope.

122.
In Figure 23-1, if the black dog starts pulling on the rope harder than the white dog, what will happen to the rope?

123.
In Figure 23-1, how could the rope-on-black-dog force be increased?

124.
In Figure 23-1, if the rope moves toward the white dog, what do you know about the forces on the rope?

125.
If you throw a ball into the air, after it leaves your hand, what is/are the net force(s) acting on it? Describe the ball's acceleration.

126. A coasting car slows down from 27 m/s to 24 m/s in 6 s. What is the car’s acceleration?

127. The maximum acceleration of a fist in a karate punch is 3800 m/s2. The mass of the fist is 0.70 kg. If the fist hits a wooden block, what force does the wood place on the fist?

128. When a ball is dropped it is easy to see that Earth exerts a force on it. Why can’t you tell that the ball exerts a force on Earth?

129. If you and your friend ride bumper cars at the fair, what happens, in terms of Newton’s third law, when they collide?

130. If you bump into a heavy desk sitting on a carpet, it doesn’t move. Explain.

Problem

131.
A top-fuel dragster accelerates from rest to a velocity of 100 m/s in 8 s. What is the acceleration?

132.
On Planet Zorg, a 30-kg barbell can be lifted by only exerting a force of 180 N. What is the acceleration of gravity on Planet Zorg?

133.
A racing car has a mass of 750 kg. It undergoes an acceleration of 4.00 m/s2. What is the net force acting on the car?

134.
0.30 s after seeing a puff of smoke rise from the starter's pistol, the sound of the firing of the pistol is heard by the track timer 100 m away. What is the speed of sound?

Essay

135. An astronaut in the space shuttle turns a screwdriver clockwise. The astronaut starts to rotate in a counterclockwise direction. Why does this happen?

136. You are worried about a severe storm in your area. You hear a weather broadcast that says that the storm is moving at a speed of 25 km/h. Is this all you need to know for safety? Explain why or why not in terms of speed and velocity.

137. You ride three full turns around on a merry-go-round horse. What is your displacement? Your speed is constant; is your velocity constant? Why or why not?

138. A dog on a chain is fastened to the side of a house.
a. As the dog pulls on the end of the chain, name two pairs of action-reaction forces acting on the chain.
b. What are the balanced forces on the chain?
c. What happens to the forces on the chain if the dog pulls the chain away from the wall and runs to play?

7th Grade - Check this out on Ph

Here is the sight - when you enter you only have 5 minutes in each experiment - unless you sign up for the free 30 day trial.
http://www.explorelearning.com/index.cfm?method=cSearch.actDoSearch&NewSearch=1&uncompiledQuery=ph+analysis&Submit=GO

6th Grade Additional Test Prep - Chapter 14

Tables and Graphs
Directions: Match the information in Column I with the best way to display it from Column II. Write the letter of the correct term in the blank at the left. A letter may be used more than once.
Column I
Column II
a. bar graph b. circle graph c. line graph d. table
_____ 1. amount of rainfall in an area each month for a year_____
2. how the constellations change position over several hours_____
3. percents of the most abundant metals in Earth's crust_____
4. percents of the different gases in the atmosphere on Mars_____
5. daily high and low tide times for a week_____
6. how a sound wave travels through the air

Directions: Use the paragraph below to complete question 7.
Some animals can live much longer than others. For example, both the golden eagle and the blue whale have a maximum life span of more than 80 years, while a guppy's maximum life span is only five years. A giant spider may live 20 years, a lobster 50 years, and a crocodile may live 60 years.
Make a chart and draw a graph to display the data given in the paragraph.


What is science?
Directions: List the steps that are usually followed in scientific methods.
What does SI stand for?
Directions: Match each unit with what it measures by writing the correct letter in the space provided.
_____ 9. meter
a. length
_____ 10. liter
b. mass
_____ 11. kilogram
c. volume
Directions: Answer the following questions on the lines provided.
Suppose a scientist wants to test a new drug to fight the flu. The scientist injects the drug into three people with the flu. The scientist injects a harmless solution into three other people with the flu. In this experiment, what is the variable group and what is the control group?
Why is it necessary to follow safety rules in the science laboratory?
What is the difference between a theory and a scientific law?

6th Grade Reveiw test

This is NOT the test, but only a practice guide to help students identify areas that need more study time. The questions below are not on the TEST and do not cover ALL topics on the test.

Measurement
I. Testing Concepts
Directions: completes each statement or answers the question.
1. A pitcher holds 1.725 L. What is the capacity of the pitcher to the nearest liter?
2. Which unit would you use to measure the length of a mailbox?
3. The temperature on a spring day is 18°C. To the nearest whole number, what is the temperature in kelvins?
4. A scale is marked in tenths of a kilogram. To what precision can the mass of a bag of apples be measured?
5. Which of the following is NOT a measurement?
6. Which multiplier would you use to convert 1.9 km to meters?
7 Which unit would you use to measure the distance from Dallas, Texas, to Memphis, Tennessee?
8. Suppose you traveled to Mars. Compare your weight and your mass on Mars to your weight and mass on Earth.
a. Both your weight and mass would remain the same.b. Your weight would remain the same, your mass would change.c. Your weight would change, your mass would remain the same.d. Both your weight and your mass would change.
9. A digital thermometer shows the temperature as 21.2°C. The thermometer is precise to the nearest ______.
10. What property of an object is measured in grams?
11. A section of a circle graph measures 180°. What percent of a circle graph is this section?
12. What unit would you use to measure the area of a carpet?
13. Which graph would best show what percent of your class wears glasses?
14. Data in a table is organized ______.
15. What unit would you use to measure the length of a carpet?
16. Which is a reasonable estimate of the length around your wrist?
17. Which is the symbol for the SI unit of temperature?
18. How would you calculate the angle to show 20% in a circle graph?
19. Which is NOT an SI unit?
II. Understanding Concepts
Skill: Making and Using a Table
Create a Circle graph using the below numbers
1. Adult females
15
2. Adult males
12
3. Juvenile females
18
4. Juvenile males
15
Skill: Graphing
Use the angles from the table and your estimation skills to sketch a circle graph.
Suppose you want to graph the number of each type of sparrow. What kind of graph would you use?
III. Applying Concepts
Directions: Answer the following questions.
Explain how you would round 2.625 m to the nearest tenth of a meter.
How many centimeter cubes can be shipped in this box?
List these masses in order from greatest to least: 6471 mg, 9 kg, 76 mg, 422 g.
IV. Writing Skills
Directions: Answer the following questions using complete sentences.
How could you estimate a cat's length if you did not have a ruler?
Jenny says she can identify an SI base unit because a base unit does not contain a prefix. Is she right?

7th Grade - Chapter 3 Practice Test

This Practice test is solely to aid students. These are not the actual test questions but simialr questions that will help the students practice.

Inside the Atom
I. Testing Concepts
Directions: For each of the following, complete the sentence.
1. ______ contain(s) only one kind of atom.
2. A(n) ______ is the basic unit of matter.
3. Particles in an atom's nucleus that do not have an electric charge are called ______.
4. The atomic mass of an atom consists of the mass of the ______.
5. In an atom, the electrons can be found in the ______.
6. J. J. Thomson used the fact that ______ charges attract each other in his cathode-ray tube experiment.
7. The mass number of an isotope is the number of ______.
8. Isotopes are atoms of the same element that have a different number of ______.
9. To find the number of neutrons in an isotope, subtract the______.
a. atomic number from the mass numberb. mass number from the atomic numberc. number of isotopes from the mass numberd. number of protons from the number of electrons
_______ 10. The most stable isotope of an atom with 12 protons probably has ______ neutrons.
11. The strong nuclear force holds the ______ together.
12. Radioactive decay is the release of ______.
13. A(n) ______ particle consists of two protons and two neutrons.
14. The changing of one element into another in radioactive decay is called ______.
15. Radioactive decay can be affected by ______.
16. A radioactive isotope has a half-life of 100 years. A sample of 40 g of the isotope will have a mass of ______ g in 200 years.
17. Tracer elements can be used without danger to people because they have ______ halflives.
Directions: Identify each statement as true or false. Rewrite false statements to make them correct.
18. A proton is a positively charged particle present in the nucleus of all atoms.
19. The mass of a proton is much greater than the mass of a neutron.
20. Atoms of the same element can have a different number of neutrons.
21. Dalton believed that the atom was a hard sphere that was the same throughout.
22. J. J. Thomson did experiments that showed that atoms cannot be divided into smaller particles.
23. Rutherford's experiment showed that alpha particles could pass through foil because most of an atom is neutrally charged.
24. The strong nuclear force can hold the protons of an atom together only if the protons are far apart.
25. Once a living organism dies, the amount of carbon-14 cannot be replaced.
II. Understanding Concepts
Skill: Outlining
Directions: Answer the following questions on the lines provided.
In an outline, the subtopics are neutron, proton, and electron. What is the main topic?
In an outline, the subtopics are fossil dating, cancer detection, and circulation problems. What is the main topic?
III. Applying Concepts
Directions: Do the following calculation. Show your work in the space provided.
An atom has a mass number of 53 and an atomic number of 26. How many neutrons does it have? Include a formula that explains your calculation.
The isotopes of carbon (carbon-12, carbon-13, and carbon-14) have different mass numbers. Each isotope has six protons. Explain how you can determine the number of neutrons in each isotope.
A certain element has a half-life of 20 years. A scientist starts with 100 g of the element.
How many grams remain after 20 years?
How many grams remain after 40 years?
How many half-lives are there in a 100-year span? How many grams of the sample would remain at the end of the 100 years?
IV. Writing Skills
Directions: Answer the following question in complete sentences.
How is americium-241 used in smoke detectors?

7th Grade - Chapter 3 Study Sheet

This sheet does not contain all items on the test. It is just a quick review sheet that should help you target in on the areas you need to study more.

The Nucleus
Directions: Answer the following questions on the lines provided.
What does the atomic number of an element refer to?
Define isotopes. ________________________________________________________________
What is the strong nuclear force? __________________________________________________
Name two types of transmutations. _________________________________________________
Explain what happens during transmutation. __________________________________________
What is radioactive decay?
Describe an alpha particle.
Describe a beta particle.
What is meant by the half-life of a radioactive isotope?
Why are nuclear waste products a problem?
Why are tracer elements important?
Directions: Identify each statement as true or false. Rewrite the false statements to make them correct.
Radioactive isotopes used for medical purposes should have long half-lives.
Scientists can use particle accelerators to create new elements.
Archaeologists can estimate the age of any ancient artifact with carbon dating.
The half-life of a radioactive isotope decreases as the isotope decays.

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