# Forces & Newton�s Laws of Motion by ee3kYaGM

VIEWS: 6 PAGES: 9

• pg 1
```									Newton’s First
Law of Motion

Chapter 3
Section 2
Newton’s First Law of Motion
• Sir Isaac Newton (1642 – 1727) was able to
state rules describing the effect of forces on
motion of objects that are still true today.
• These rules are known as:
Newton’s Laws of Motion

• Newton’s First Law of Motion is also called
The Law of Inertia
Newton’s First Law of Motion
• An object moving at a constant velocity
keeps moving at that velocity unless a
net force acts on it.
• If an object is at rest, it will stay at rest,
unless a net force acts on it.
• If an object is in motion, it will stay in
motion, unless a net force acts on it.
Newton’s First Law of Motion
What Happens in a Crash?

• Newton’s Law First Law of Motion
• If you are traveling at 50 kilometers per hour
and you hit a tree…
What Happens in a Crash?

• If you are not wearing your seatbelt…
• The car is stopped by the tree and you
continue to move forward at a speed of 50
kilometers per hour until you hit the
dashboard, steering wheel, windshield, etc.
• You would hit at the same speed you would
reach if you fell from a three-story building.
What Happens in a Crash?

• If you are wearing your seatbelt…
• The seatbelt loosens a little upon impact and
will hold you.
• This allows your body to be slowed down