# Physics: The First Science

By Peter Lindenfeld; Suzanne White Brahmia | Go to book overview

CHAPTER 4

Forces and Motion: Newton’s
Framework
Newton’s laws of motion
 When forces add up to zero: the first law What force really is: the second law Units Inertial mass, gravitational mass, and the principleof equivalence
 One dimension Two or more dimensions Force diagrams Vector components More on friction Object or system?
Momentum and its conservation. Action, reaction,
and Newton’s third lawOne more motion that is everywhere: rotation
 Uniform circular motion Angular momentum and torque The angular momentum of particles

What does it take to get something to move? You have to push a book to make
it start to slide along the table. You have to throw a ball to make it leave your
hand to fly through the air. The push on the book and that of your hand on the
ball as you throw it are the forces that determine the motion. The book’s motion
depends not only on how hard you push, but also on the table and how smooth
it is. The ball’s motion also depends on forces other than that of your hand. Once
the ball leaves your hand, the hand no longer exerts a force on it. The other forces
continue to act: the earth pulls it down with the force of gravity. And on its way
the air pushes against it and affects the path that it follows.

-57-

If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items
Notes

#### Cited page

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA 8, MLA 7, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

(Einhorn 25)

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

#### Cited page

Physics: The First Science

Settings

#### Settings

Typeface
Text size Reset View mode
Search within

Look up

#### Look up a word

• Dictionary
• Thesaurus
Please submit a word or phrase above.

Why can't I print more than one page at a time?

Help
Full screen
Items saved from this book
• Bookmarks
• Highlights & Notes
• Citations
/ 368

### How to highlight and cite specific passages

1. Click or tap the first word you want to select.
2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

## Cited passage

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA 8, MLA 7, APA and Chicago citation styles.

"Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

"Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

"Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

"Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

## Thanks for trying Questia!

Please continue trying out our research tools, but please note, full functionality is available only to our active members.

Your work will be lost once you leave this Web page.