Download Lesson One‐Newton`s First Law

Lesson
One‐Newton’s
First
Law
Name_______________________________
Source:
http://www.physicsclassroom.com/Physics‐Tutorial/Newton‐s‐Laws
Section
A
Newton’s
First
Law
1.
State
Newton’s
First
Law:
An
object
at
rest
stays
at
rest
and
an
object
in
motion
continues
to
move
at
the
same
speed
and
in
same
direction
unless
acted
upon
by
an
unbalanced
force.
2.
The
state
of
motion
of
an
object
is
maintained
as
long
as
the
object
is
not
acted
upon
by
an
_____unbalanced
force__________
3.
All
objects
resist
____a
change
in
its
motion__________
‐
they
tend
to
"keep
on
doing
what
they're
doing."
4.
What
device
in
an
automobile
provides
an
unbalanced
force
that
brings
you
from
a
state
of
motion
to
a
state
of
rest?____brakes___________
How
does
this
device
accomplish
this?
Force
of
the
brake
pads
on
the
rotor
of
the
wheel
causes
the
wheel
to
be
slowed.
This
friction
reduces
the
speed
of
the
car
5.
How
would
Newton’s
First
Law
apply
to
blood
rushing
from
your
head
to
your
feet
while
quickly
stopping
a
descending
elevator?
Since
force
is
applied
externally
it
has
no
effect
on
blood.
Blood
continues
moving
in
a
downward
direction
until
it
can
no
longer
do
so.
6.
How
would
Newton’s
First
Law
apply
to
your
falling
forward
when
you
trip
over
a
rock?
When
tripping
over
a
rock,
your
foot
has
the
force
applied
to
it
causing
it
to
stop.
Your
upper
body
does
not
experience
the
force
and
continues
to
move
forward.
Section
B
Inertia
and
Mass
7.
Define
inertia
:
The
resistance
an
object
has
to
its
state
of
motion
8.
The
idea
that
dominated
people's
thinking
for
nearly
2000
years
prior
to
Newton
was
that
it
was
the
natural
tendency
of
all
objects
to
assume
a
rest
position.
Explain
this
statement.
Ancient
peoples
believed
that
the
natural
state
of
all
objects
was
at
rest.
They
believed
that
a
force
was
needed
to
maintain
motion.
Newton
suggested
his
First
Law
which
disputed
that
claim
9.
Who
developed
the
concept
of
inertia?___Galileo_________
10.
Sketch
and
explain
Galileo’s
experiment
illustrating
the
concept
of
inertia.
Without
friction
ball
would
rise
to
the
same
height.
In
experiment,
friction
prevented
ball
from
rising
to
the
exact
same
height.
If
flat
and
without
friction,
ball
would
roll
forever‐move
inertially
1.
A
force
(is,
is
not)
required
to
keep
a
moving
object
in
motion.
12.
All
objects
resist
changes
in
their
state
of
motion.
All
objects
have
inertia.
The
more
inertia
that
an
object
has,
the
(more
massive
it
is,
less
massive
it
is,...mass
does
not
affect
inertia)
13.
Without
lifting
them,
how
could
you
tell
the
difference
between
a
concrete
brick
and
a
styrofoam
brick
that
appear
to
be
identical?
Apply
equal
force
to
the
two
objects,
the
object
moved
more
easily
would
have
less
inertia
and,
therefore,
less
mass.
14.
Read
Check
Your
Understanding
and
be
able
to
discuss
the
correct
answers.
1.
Rock
would
continue
forever
unless
acted
upon
by
an
unbalanced
force
2.
No
force
is
needed
for
there
is
no
acceleration
3.
Inertia
is
independent
of
speed
Section
C
State
of
Motion
15.
How
could
you
redefine
inertia
utilizing
the
term
velocity?
Tendency
of
an
object
to
resist
a
change
in
its
velocity
16.
How
could
you
redefine
inertia
utilizing
the
term
acceleration?
Tendency
of
an
object
to
resist
acceleration
Section
D
Balanced
and
Unbalanced
Forces
17.
How
would
you
describe
balanced
forces?
When
all
forces
acting
on
an
object
in
one
direction
are
opposed
by
equal
forces
in
the
opposite
direction.
The
sum
of
all
forces
in
one
direction
adds
to
zero...zero
net
force
18.
When
forces
are
balanced
,
they
are
said
to
be
in
____equilibrium_______
19.
If
an
object
is
not
at
equilibrium
and
subsequently
accelerates,
what
is
the
cause
of
the
acceleration?
________the
unbalanced
forces____________
20.
Balanced
forces
must
be
_____equal
in
size_______________and
__________________
_____opposite
in
direction_____.
21.
If
the
term
net
force
refers
to
the
adding
up
of
all
forces
acting
in
one
direction.
The
net
force
resulting
from
balanced
forces
would
be
(equal
to
zero,
less
than
zero,
greater
than
zero)
The
net
force
resulting
from
unbalanced
forces
would
be
(equal
to
zero,
not
equal
to
zero)