Newton’s Three Laws of
Physics
Unit Vocabulary
Newton’s Toy Box
Sir Isaac Newton
Sir Isaac Newton discovered
the principals (or laws) that
explain how things move on
earth’s surface and in space.
He discovered that force and
motion are connected.
Unit Vocabulary
Newton’s Toy Box
There are 3 laws he came up
with…
Newton’s First Law of Motion
Newton’s Second Law of Motion
Newton’s Third Law of Motion
Unit Vocabulary
Newton’s Toy Box
Newton’s First Law or
Law of Inertia
An object in motion will remain in
motion unless acted on by
another force.
Ex. The ball this boy kicked would
keep going forever if it weren’t for the
forces of gravity and wind resistance, etc.
Newton’s First Law or
Law of Inertia
An object at rest will remain at
rest unless acted on by another
force.
Ex. The ball will stay in the same
position forever unless someone
kicks it.
What will happen according to
Newton’s First Law of Motion?
Answer: The car would continue
forever unless a force acted on it.
Newton’s 1st Law: An object in
motion stays in motion unless
acted on by another force.
Unit Vocabulary
Newton’s Toy Box
Newton’s Second Law
Force = Mass X Acceleration
=
X
Found on your formula chart.
What do you think?
Which will accelerate faster, a car
with one person pushing it or the
same car with eight people
pushing it?
Help Me!
What do you think?
Answer: 8 people because they
have more force!!
Help Me!
Forces and Motion are
Connected
An object will have
greater acceleration if a
greater force is applied
to it
Unit Vocabulary
Newton’s Toy Box
SB
What do you think?
Which will accelerate faster, a car
with two people pushing it or the
same two people pushing a fully
loaded gravel truck?
Unit Vocabulary
Newton’s Toy Box
What do you think?
Answer: They push with the
same force, so the car because it
has less mass!!
Unit Vocabulary
Newton’s Toy Box
Forces and Motion are
Connected
The mass of an object
also affects acceleration
along a horizontal
surface
Unit Vocabulary
Newton’s Toy Box
Newton’s Second Law
In other words:
If it’s big, it’s going to move slow
If you push it harder it is going to
go farther
Unit Vocabulary
Newton’s Toy Box
What is the relationship between
acceleration (rate of change of speed
and direction) and mass (amount of
matter an object contains)?
The ball with the greater mass has
less acceleration and it rolls
slower…like Peter Griffin.
The ball with the lesser mass has
more acceleration and it rolls
faster…like Stewie.
Unit Vocabulary
Newton’s Toy Box
The steel ball has a greater mass
than the wooden ball. Each ball
accelerated at the same rate.
The steel ball must have
experienced a greater
unbalanced external force.
Unit Vocabulary
Newton’s Toy Box
What will happen…
The two balls hit
the ground at the
same time and
were dropped
from the same
height. They
accelerated at
the same rate.
Unit Vocabulary
Newton’s Toy Box
Newton’s
rd
3
Law
For every action there is an equal
and opposite reaction.
Unit Vocabulary
Newton’s Toy Box
When you push down on
the grasshopper’s nose,
the action force is
transferred to the table.
Unit Vocabulary
Newton’s Toy Box
As the grasshopper pushes down
on the table, the table pushes
upward with a reaction force on
the grasshopper, so the
grasshopper flips.
Unit Vocabulary
Newton’s Toy Box
Action/Reaction
The action was
pressing down on
the nose.
The reaction was
the grasshopper
flipping.
Unit Vocabulary
Newton’s Toy Box
Let’s Review…
Newton’s First
Law of Motion
Unit Vocabulary
Newton’s Toy Box
Newton’s First Law
An object in motion will remain in
motion unless acted on by
another force.
An object at rest will remain at
rest unless acted on by another
force.
Unit Vocabulary
Newton’s Toy Box
Let’s Review…
Newton’s Second
Law of Motion
Unit Vocabulary
Newton’s Toy Box
Newton’s Second Law
Force = Mass X Acceleration
=
X
F= m x a
a = F/m
Unit Vocabulary
Newton’s Toy Box
Let’s Review…
Newton’s Third
Law of Motion
Unit Vocabulary
Newton’s Toy Box
Newton’s
rd
3
Law
For every action there is an equal
and opposite reaction.
Unit Vocabulary
Newton’s Toy Box