This document summarizes Newton's three laws of motion. It explains the first law of inertia, which states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force. It provides examples using eggs to illustrate the concepts of balanced and unbalanced forces and how they relate to an object changing or maintaining its motion. Safety tips are also given related to wearing seatbelts based on the first law of inertia.

1. Newton’s
Laws of
MotionI. Law of Inertia
II. F=ma
III. Action-Reaction

2. Newton’s Laws of Motion
 1st Law – Inertia
 2nd Law – F=ma
 3rd Law – Action-Reaction

3. 1st Law of Motion
(Law of Inertia)
An object at rest will stay at
rest, and an object in motion
will stay in motion at
constant velocity, unless acted
upon by an unbalanced force.

4. 1st Law
 Inertia is the
tendency of an
object to resist
changes in its
velocity:
whether in
motion or
motionless.
These pumpkins will not move unless acted on
by an unbalanced force.

5. Force
 A push or pull

6. Forces At Rest
 There are forces acting on the
egg.
 Gravity is pulling the egg down
 A force called the normal force is
keeping the egg from falling
 The forces are balanced so
there is no change in motion.
 This egg will stay there forever
unless a unbalanced force acts
on it.
 It might get stinky after a
while!

7. Throwing the egg
 The force of your
hand pushing the
egg as you throw it
is unbalanced.
 Unbalanced means
there is no force
countering it.
 The result of the
unbalanced force is
a change in motion

8. Forces in Motion
 Once the egg is in flight, it would never stop.
 The unbalanced forces that affect its motion
while in flight.
 Gravity
 Air Resistance
(Friction)

9. Catching the Egg
 When the egg is
caught, the unbalanced
force of your hands
changes the motion of
the egg.

10. Inertia of the yolk
 The force of your hands
stops the shell.
 The yolk inside the egg
is stopped by the shell.
 If the force of your hand
breaks the shell,
 The inertia of the yolk
will cause it to continue
moving.

11. Egg Toss
 Every year in July, there is a National Egg
Toss Competition in Hagerstown, Maryland.
 2005 Champions threw the egg 63 ft. 2 in.
 According to the Guinness Book of World
Records, on November 12, 1978 a Johnny Dell
Foley successfully tossed a fresh hen's egg for
a distance of 323 ft 2in (98.51m) to a Keith
Thomas at Jewett, Texas.

12.  There are four main types of friction:
 Sliding friction: ice skating
 Rolling friction: bowling
 Fluid friction (air or liquid): air or water resistance
 Static friction: initial friction when moving an
object

13. Newtons’s 1st Law and You
Don’t let this be you. Wear seat belts.
Because of inertia, objects (including you) resist changes
in their motion. When the car going 80 km/hour is stopped
by the brick wall, your body keeps moving at 80 m/hour.