Question 1

In which of the following situations would the object be experiencing an unbalanced force?

Accepted Answer

A)  A truck at rest 
B)  An car moving at constant speed turning a corner 
C)  A rocket moving at a constant speed straight up away from the Earth 
D)  A car moving at a constant speed towards the right 
A)  A truck at rest 
B)  An car moving at constant speed turning a corner 
C)  A rocket moving at a constant speed straight up away from the Earth 
D)  A car moving at a constant speed towards the right

Question 2

You apply a force of 10 N to a grocery cart in order to get an acceleration of 0.5 m/s2.If you apply a force of 20 N to the same grocery cart,its acceleration will be:

Accepted Answer

A)  10 m/s2 
B)  1 m/s2 
C)  0.5 m/s2 
D)  0.25 m/s2 
A)  10 m/s2 
B)  1 m/s2 
C)  0.5 m/s2 
D)  0.25 m/s2

Question 3

Astronauts feel "weightless" on the Moon.Using Newton's universal law of gravitation,explain why this statement is true or false and why astronauts experience this feeling.

Accepted Answer

Because the mass of the Moon is smaller

Question 4

In the figure below,the force of gravity is drawn in the picture.This represents Earth's gravity pulling down on the man.According to Newton's third law,what is the other half of this pair of forces?

Accepted Answer

A)  The floor pushing up on the man. 
B)  The man pushing on the floor. 
C)  The man's gravity pulling up on the Earth. 
D)  The floor pushing backwards on the man. 
A)  The floor pushing up on the man. 
B)  The man pushing on the floor. 
C)  The man's gravity pulling up on the Earth. 
D)  The floor pushing backwards on the man.

Question 5

Two rocks (call them S and T)are a distance of 50 km from one another.Rock S has 20 times the mass of rock T.Which rock will move faster if the only force involved is their mutual gravitational attraction?

Accepted Answer

A)  Rock S 
B)  Both rocks will move at the same speed. 
C)  Rock T 
D)  Not enough information is available to answer. 
A)  Rock S 
B)  Both rocks will move at the same speed. 
C)  Rock T 
D)  Not enough information is available to answer.

Question 6

What force holds planets in their orbits?

Accepted Answer

A)  Air resistance 
B)  Friction 
C)  Electromagnetic 
D)  Gravity 
A)  Air resistance 
B)  Friction 
C)  Electromagnetic 
D)  Gravity

Question 7

Which of the following is true about a comet that is on an elliptical orbit around the Sun?

Accepted Answer

A)  The comet's speed is greatest when it is farthest from the Sun. 
B)  The comet's speed is greatest when it is nearest the Sun. 
C)  This comet's speed is zero. 
D)  The comet's speed is constant because its mass and the Sun's mass stay approximately the same. 
A)  The comet's speed is greatest when it is farthest from the Sun. 
B)  The comet's speed is greatest when it is nearest the Sun. 
C)  This comet's speed is zero. 
D)  The comet's speed is constant because its mass and the Sun's mass stay approximately the same.

Question 8

Which of the following is NOT an example of a satellite of the Earth?

Accepted Answer

A)  The Moon 
B)  The Hubble Telescope 
C)  The Sun 
D)  Communication satellites 
A)  The Moon 
B)  The Hubble Telescope 
C)  The Sun 
D)  Communication satellites

Question 9

How much stronger is the gravitational force of the Sun on the Earth compared to the gravitational force of the Sun on Pluto? Note that Pluto's semimajor axis is 40 AU and its mass is 0.002 times the mass of the Earth.

Accepted Answer

The force of gravity between a planet of

Question 10

Is there a difference in your weight between when you are on top of a mountain at 1,000 m above sea level compared to when you are sitting in a classroom at 10 m above sea level?

Accepted Answer

Yes,you weigh less on the mountaintop be

Question 11

What acceleration would result from a 5-N force acting on a 3-kg object? (A Newton [N] has units of kg m/s2.)

Accepted Answer

a = F/m =

Question 12

Explain the difference between being weightless and being in free fall.

Accepted Answer

The only way to be truly weightless is t

Question 13

If we wanted to increase the Hubble Space Telescope's altitude above the Earth and keep it in a stable orbit,we also would need to:

Accepted Answer

A)  increase its orbital speed 
B)  increase its weight 
C)  decrease its weight 
D)  decrease its orbital speed. 
A)  increase its orbital speed 
B)  increase its weight 
C)  decrease its weight 
D)  decrease its orbital speed.

Question 14

In the figure below,the woman pushes on each object with the same force.If the resulting acceleration of the 100 kg object is 1 m/s2,then the acceleration of the 200 kg object is 2 m/s2.

Accepted Answer

A) True 
 B)False

Question 15

The force of gravity between the Earth and the Sun is __________ the force of gravity between the Earth and the Moon.For reference,the average distance between the Earth and the Moon is 0.003 AU,the mass of the Moon is 7 × 1022 kg,and the mass of the Sun is 2 × 1030 kg.

Accepted Answer

A)  86,000 times larger than 
B)  260 times larger than 
C)  140 times smaller than 
D)  6,400 times smaller than 
A)  86,000 times larger than 
B)  260 times larger than 
C)  140 times smaller than 
D)  6,400 times smaller than

Question 16

What type of orbit results when a satellite has a velocity greater than the escape velocity?

Accepted Answer

A)  Unbound 
B)  Bound 
C)  Circular 
D)  Linear 
A)  Unbound 
B)  Bound 
C)  Circular 
D)  Linear

Question 17

Name the two ways in which an object's motion (meaning its velocity)can experience a nonzero acceleration.

Accepted Answer

The object can have a nonzero

Question 18

If a 100-kg astronaut pushes on a 5,000-kg satellite and the satellite experiences an acceleration of 0.1 m/s2,what is the acceleration experienced by the astronaut in the opposite direction?

Accepted Answer

A)  5 m/s2 
B)  10 m/s2 
C)  50 m/s2 
D)  0.1 m/s2 
A)  5 m/s2 
B)  10 m/s2 
C)  50 m/s2 
D)  0.1 m/s2

Question 19

A kilogram of lead has more mass than a kilogram of feathers.

Accepted Answer

A) True 
 B)False

Question 20

Examine the figure below.What is the name of the force that the string exerts on the ball?

Accepted Answer

A)  Centripetal force 
B)  Gravity 
C)  Friction force 
D)  Air resistance 
A)  Centripetal force 
B)  Gravity 
C)  Friction force 
D)  Air resistance

In which of the following situations would the object be experiencing an unbalanced force?

You apply a force of 10 N to a grocery cart in order to get an acceleration of 0.5 m/s².If you apply a force of 20 N to the same grocery cart,its acceleration will be:

Astronauts feel "weightless" on the Moon.Using Newton's universal law of gravitation,explain why this statement is true or false and why astronauts experience this feeling.

In the figure below,the force of gravity is drawn in the picture.This represents Earth's gravity pulling down on the man.According to Newton's third law,what is the other half of this pair of forces?

Two rocks (call them S and T)are a distance of 50 km from one another.Rock S has 20 times the mass of rock T.Which rock will move faster if the only force involved is their mutual gravitational attraction?

What force holds planets in their orbits?

Which of the following is true about a comet that is on an elliptical orbit around the Sun?

Which of the following is NOT an example of a satellite of the Earth?

How much stronger is the gravitational force of the Sun on the Earth compared to the gravitational force of the Sun on Pluto? Note that Pluto's semimajor axis is 40 AU and its mass is 0.002 times the mass of the Earth.

Is there a difference in your weight between when you are on top of a mountain at 1,000 m above sea level compared to when you are sitting in a classroom at 10 m above sea level?

What acceleration would result from a 5-N force acting on a 3-kg object? (A Newton [N] has units of kg m/s².)

Explain the difference between being weightless and being in free fall.

If we wanted to increase the Hubble Space Telescope's altitude above the Earth and keep it in a stable orbit,we also would need to:

In the figure below,the woman pushes on each object with the same force.If the resulting acceleration of the 100 kg object is 1 m/s²,then the acceleration of the 200 kg object is 2 m/s².

The force of gravity between the Earth and the Sun is __________ the force of gravity between the Earth and the Moon.For reference,the average distance between the Earth and the Moon is 0.003 AU,the mass of the Moon is 7 × 10²² kg,and the mass of the Sun is 2 × 10³⁰ kg.

What type of orbit results when a satellite has a velocity greater than the escape velocity?

Name the two ways in which an object's motion (meaning its velocity)can experience a nonzero acceleration.

If a 100-kg astronaut pushes on a 5,000-kg satellite and the satellite experiences an acceleration of 0.1 m/s²,what is the acceleration experienced by the astronaut in the opposite direction?

A kilogram of lead has more mass than a kilogram of feathers.

Examine the figure below.What is the name of the force that the string exerts on the ball?

Our Place in the Universe

Patterns in the Skymotions of Earth

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Expansion of Space

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

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Exam 3: Laws of Motion

In which of the following situations would the object be experiencing an unbalanced force?

You apply a force of 10 N to a grocery cart in order to get an acceleration of 0.5 m/s2.If you apply a force of 20 N to the same grocery cart,its acceleration will be:

Astronauts feel "weightless" on the Moon.Using Newton's universal law of gravitation,explain why this statement is true or false and why astronauts experience this feeling.

In the figure below,the force of gravity is drawn in the picture.This represents Earth's gravity pulling down on the man.According to Newton's third law,what is the other half of this pair of forces?

Two rocks (call them S and T)are a distance of 50 km from one another.Rock S has 20 times the mass of rock T.Which rock will move faster if the only force involved is their mutual gravitational attraction?

What force holds planets in their orbits?

Which of the following is true about a comet that is on an elliptical orbit around the Sun?

Which of the following is NOT an example of a satellite of the Earth?

How much stronger is the gravitational force of the Sun on the Earth compared to the gravitational force of the Sun on Pluto? Note that Pluto's semimajor axis is 40 AU and its mass is 0.002 times the mass of the Earth.

Is there a difference in your weight between when you are on top of a mountain at 1,000 m above sea level compared to when you are sitting in a classroom at 10 m above sea level?

What acceleration would result from a 5-N force acting on a 3-kg object? (A Newton [N] has units of kg m/s2.)

Explain the difference between being weightless and being in free fall.

If we wanted to increase the Hubble Space Telescope's altitude above the Earth and keep it in a stable orbit,we also would need to:

In the figure below,the woman pushes on each object with the same force.If the resulting acceleration of the 100 kg object is 1 m/s2,then the acceleration of the 200 kg object is 2 m/s2.

The force of gravity between the Earth and the Sun is __________ the force of gravity between the Earth and the Moon.For reference,the average distance between the Earth and the Moon is 0.003 AU,the mass of the Moon is 7 × 1022 kg,and the mass of the Sun is 2 × 1030 kg.

What type of orbit results when a satellite has a velocity greater than the escape velocity?

Name the two ways in which an object's motion (meaning its velocity)can experience a nonzero acceleration.

If a 100-kg astronaut pushes on a 5,000-kg satellite and the satellite experiences an acceleration of 0.1 m/s2,what is the acceleration experienced by the astronaut in the opposite direction?

A kilogram of lead has more mass than a kilogram of feathers.

Examine the figure below.What is the name of the force that the string exerts on the ball?

Our Place in the Universe

Patterns in the Skymotions of Earth

Light and Telescopes

The Formation of Stars and Planets

Terrestrial Worlds in the Inner Solar System

Atmospheres of Venus, Earth, and Mars

The Giant Planets

Small Bodies of the Solar System

Measuring the Stars

Our Star: The Sun

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

The Expansion of Space

The Realm of the Galaxies

Our Galaxy: The Milky Way

Modern Cosmology and the Origin of Structure

Life in the Universe

Filters

You apply a force of 10 N to a grocery cart in order to get an acceleration of 0.5 m/s².If you apply a force of 20 N to the same grocery cart,its acceleration will be:

What acceleration would result from a 5-N force acting on a 3-kg object? (A Newton [N] has units of kg m/s².)

In the figure below,the woman pushes on each object with the same force.If the resulting acceleration of the 100 kg object is 1 m/s²,then the acceleration of the 200 kg object is 2 m/s².

The force of gravity between the Earth and the Sun is __________ the force of gravity between the Earth and the Moon.For reference,the average distance between the Earth and the Moon is 0.003 AU,the mass of the Moon is 7 × 10²² kg,and the mass of the Sun is 2 × 10³⁰ kg.

If a 100-kg astronaut pushes on a 5,000-kg satellite and the satellite experiences an acceleration of 0.1 m/s²,what is the acceleration experienced by the astronaut in the opposite direction?