Question 1

If every action of a force is met by an equal but opposite force,why does anything accelerate?

Accepted Answer

The action-reaction force pair described by Newton's Third Law are not applied to the same object.

Question 2

The centrifugal force experienced by a body in circular motion is a reaction to:

Accepted Answer

A)  the force of gravity. 
B)  the body's weight. 
C)  the force that causes the motion to be circular. 
D)  the contact forces between the molecules of the material. 
A)  the force of gravity. 
B)  the body's weight. 
C)  the force that causes the motion to be circular. 
D)  the contact forces between the molecules of the material. C

Question 3

The figure below shows Newton's cannonball thought experiment.At the three locations of the cannonball shown,draw and label arrows representing the circular velocity and acceleration.

Accepted Answer

The answer of The figure below shows Newton's cannonball thought...

Question 4

In a period of 3 months,a planet travels 30,000 km with an average speed of 10.5 km/s.Some time later,the same planet travels 65,000 km in 3 months.How fast is the planet traveling at this later time? During which period is the planet closer to the Sun?

Accepted Answer

At the later time,because the planet is

Question 5

Suppose you are suddenly transported to a planet with one-fourth the mass of Earth but the same radius as Earth.Your weight would ________ by a factor of ________.

Accepted Answer

A)  increase; 4 
B)  increase; 16 
C)  decrease; 4 
D)  decrease; 16 
A)  increase; 4 
B)  increase; 16 
C)  decrease; 4 
D)  decrease; 16

Question 6

Which of Newton's laws states that if an unbalanced force acts on an object,then the object's motion changes?

Accepted Answer

A)  Newton's first law 
B)  Newton's second law 
C)  Newton's third law 
D)  Newton's law of gravitation 
A)  Newton's first law 
B)  Newton's second law 
C)  Newton's third law 
D)  Newton's law of gravitation

Question 7

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 Earth 
D)  the floor pushing backward 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 Earth 
D)  the floor pushing backward on the man

Question 8

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 9

Examine the figure below.If the acceleration of the container is 2 m/s²,with what force did the woman push?

Accepted Answer

F = ma = 2

Question 10

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 11

How are mass and inertia related?

Accepted Answer

A)  More massive objects contain more Inertia. 
B)  Less massive objects contain more inertia. 
C)  Inertia and mass are unrelated. 
D)  Only masses in motion contain intertia. 
A)  More massive objects contain more Inertia. 
B)  Less massive objects contain more inertia. 
C)  Inertia and mass are unrelated. 
D)  Only masses in motion contain intertia.

Question 12

The force of gravity that an object has is directly related to its:

Accepted Answer

A)  inertia. 
B)  size. 
C)  mass. 
D)  density. 
A)  inertia. 
B)  size. 
C)  mass. 
D)  density.

Question 13

If your weight on Earth was 500 N,what would your weight be on the Moon?

Accepted Answer

A)  83 N 
B)  125 N 
C)  250 N 
D)  500 N 
A)  83 N 
B)  125 N 
C)  250 N 
D)  500 N

Question 14

Which scientist ended up under house arrest because of his support of the heliocentric model?

Accepted Answer

A)  Galileo Galilei 
B)  Isaac Newton 
C)  Johannes Kepler 
D)  Tycho Brahe 
A)  Galileo Galilei 
B)  Isaac Newton 
C)  Johannes Kepler 
D)  Tycho Brahe

Question 15

An empirical science is one that is based on:

Accepted Answer

A)  assumptions. 
B)  calculus. 
C)  computer models. 
D)  observed data. 
A)  assumptions. 
B)  calculus. 
C)  computer models. 
D)  observed data.

Question 16

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 17

List at least three discoveries Galileo made by making astronomical observations through a telescope.

Accepted Answer

Answers may include sunspots,c

Question 18

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 19

In a spaceship orbiting Earth,two astronauts want to measure the mass of a mouse.How can they easily do it if they are in constant free fall?

Accepted Answer

A)  Place the mouse on a spring-loaded scale and weigh it. 
B)  Measure the gravitational attraction between the mouse and a steel ball of known mass. 
C)  Drop the mouse from the top of the spaceship to its bottom. 
D)  Push on the mouse with a known force and measure its acceleration. 
A)  Place the mouse on a spring-loaded scale and weigh it. 
B)  Measure the gravitational attraction between the mouse and a steel ball of known mass. 
C)  Drop the mouse from the top of the spaceship to its bottom. 
D)  Push on the mouse with a known force and measure its acceleration.

Question 20

An analogy of orbital motion is the twirling of a ball connected by a string.What is the action-reaction force pair described by Newton's third law?

Accepted Answer

The action is the force on the

If every action of a force is met by an equal but opposite force,why does anything accelerate?

The centrifugal force experienced by a body in circular motion is a reaction to:

The figure below shows Newton's cannonball thought experiment.At the three locations of the cannonball shown,draw and label arrows representing the circular velocity and acceleration.

In a period of 3 months,a planet travels 30,000 km with an average speed of 10.5 km/s.Some time later,the same planet travels 65,000 km in 3 months.How fast is the planet traveling at this later time? During which period is the planet closer to the Sun?

Suppose you are suddenly transported to a planet with one-fourth the mass of Earth but the same radius as Earth.Your weight would by a factor of .

Which of Newton's laws states that if an unbalanced force acts on an object,then the object's motion changes?

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?

What force holds planets in their orbits?

Examine the figure below.If the acceleration of the container is 2 m/s²,with what force did the woman push?

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

How are mass and inertia related?

The force of gravity that an object has is directly related to its:

If your weight on Earth was 500 N,what would your weight be on the Moon?

Which scientist ended up under house arrest because of his support of the heliocentric model?

An empirical science is one that is based on:

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

List at least three discoveries Galileo made by making astronomical observations through a telescope.

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?

In a spaceship orbiting Earth,two astronauts want to measure the mass of a mouse.How can they easily do it if they are in constant free fall?

An analogy of orbital motion is the twirling of a ball connected by a string.What is the action-reaction force pair described by Newton's third law?

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

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

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Life in the Universe

Filters

Exam 3: Laws of Motion

If every action of a force is met by an equal but opposite force,why does anything accelerate?

The centrifugal force experienced by a body in circular motion is a reaction to:

The figure below shows Newton's cannonball thought experiment.At the three locations of the cannonball shown,draw and label arrows representing the circular velocity and acceleration.

In a period of 3 months,a planet travels 30,000 km with an average speed of 10.5 km/s.Some time later,the same planet travels 65,000 km in 3 months.How fast is the planet traveling at this later time? During which period is the planet closer to the Sun?

Suppose you are suddenly transported to a planet with one-fourth the mass of Earth but the same radius as Earth.Your weight would ________ by a factor of ________.

Which of Newton's laws states that if an unbalanced force acts on an object,then the object's motion changes?

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?

What force holds planets in their orbits?

Examine the figure below.If the acceleration of the container is 2 m/s²,with what force did the woman push?

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

How are mass and inertia related?

The force of gravity that an object has is directly related to its:

If your weight on Earth was 500 N,what would your weight be on the Moon?

Which scientist ended up under house arrest because of his support of the heliocentric model?

An empirical science is one that is based on:

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

List at least three discoveries Galileo made by making astronomical observations through a telescope.

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?

In a spaceship orbiting Earth,two astronauts want to measure the mass of a mouse.How can they easily do it if they are in constant free fall?

An analogy of orbital motion is the twirling of a ball connected by a string.What is the action-reaction force pair described by Newton's third law?

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

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

Measuring Galaxies

Our Galaxy: the Milky Way

The Evolution of the Universe

Formation of Structure

Life in the Universe

Filters

Suppose you are suddenly transported to a planet with one-fourth the mass of Earth but the same radius as Earth.Your weight would by a factor of .