Ppt Newtons First Law

1. Newton’s First Law
of Motion

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

3. 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.

4. Newton’s First Law of Motion

5. 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…

6. 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.

7. 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
gradually and decreases the unbalanced
force placed on your body.
The seatbelt could also save you from being
thrown outside the car.