Chapter 23: Newton's Laws of Motion

Observe Motion Along
Varying Slopes
Billions of stars orbit around the center of the
galaxy. The wind rattles the leaves in a grove
of trees creating a cool breeze. A roller
coaster plummets down a steep hill. Just
three laws of motion explain why objects
move the way they do and how different
types of forces cause these movements.
1. Lean one end of
a ruler on top of
three books to
form a ramp. Use a
plastic ruler with a
groove down the
middle.
2. Tap a marble so it rolls up the ramp.
Measure how far it rolls up the ramp
before stopping and rolling back down.
3. Repeat step 2 using two books, one book,
and no books. The same person should
tap the marble each time, trying to keep
the force constant.
4. Think Critically What would happen if
you tapped the marble on a flat surface
with no friction? Write your predictions
and observations in your Science Journal.
Start-Up Activities
STEP 1
STEP 2
STEP 3
STEP 4
Newton’s Laws of Motion
Make the following Foldable
to help you better understand
Newton’s laws of motion as you
read the chapter.
Draw a mark at the
midpoint of a sheet of
paper along the side
edge. Then fold the
top and bottom edges
in to touch the
midpoint.
Fold in half from
side to side.
Turn the paper
vertically. Open
and cut along the
inside fold lines to
form four tabs.
Label the tabs
Motion, First Law,
Second Law, and
Third Law.
Find Main Ideas As you read the chapter, list
the main ideas in each section under the appropriate
tab.
Preview this chapter’s content
and activities at
green.msscience.com
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(bkgd.)John H. Clark/CORBIS, (inset)Amanita Pictures