Download Newton*s 3 Laws of Motion

Sci Warm-Up: Reading Trivia!
Answer the following 3 questions with your
team and win a fabulous prize! Use your
reading to help you find the answers…
 What are Newton’s 3 Laws of Motion?
 If you drop a hammer and a feather on
the moon, which will land first?
 Why do astronauts float in space?
WRITE YOUR ANSWERS ON A PIECE OF PAPER!
Newton’s 3 Laws of
Motion
Thought Experiments…

Newton’s
st
1
Law, Part I
 Part I: When the forces acting upon an object
are balanced, meaning the net force is zero,
objects at rest (not moving) stay at rest.
Newton’s
st
1
 Part II: When the
forces acting upon an
object in motion are
balanced (the net
force is zero), the
object will continue
moving in a straight
line at a constant
speed.
Law, Part II
Newton’s 1st Law is also known
as the “Law of Inertia”.
Inertia = the tendency of an
object to resist any change in its
motion.
Galileo’s Thought
Experiment:
Newton’s 1st Law
Thought Experiment #1
Newton’s 1st Law
Thought Experiment #2
Newton’s
nd
2
Law of Motion
 If an object experiences unbalanced forces, (a
“net” force), it will change velocity, (accelerate).
 The acceleration (a) of an object varies directly
with the net force (F) acting on it and varies
inversely to it’s mass (m).
acceleration = Force
mass
Newton’s
nd
2
Law of Motion
In other words….
F = m*a
Newton’s 2nd Law of Motion
Thought Experiment #1
Newton’s 2nd Law of Motion
Thought Experiment #2
Newton’s
 When two objects
interact, each
object experiences
a force from the
other object. The
forces in this pair
are equal in size
and opposite in
direction.
rd
3
Law
rd
3
Newton’s
Law
Thought Experiment #1
rd
3
Newton’s
Law
Thought Experiment #2