Transcript inertia! - Mr-Durands

Good Morning! 4/7/2016
• Starter: when a car (or fair ride) is going
traveling around a curve it seems like there is a
force pulling you. What direction does it feel
like it is pulling you?
• Today we are going to do an activity about
inertia and then move on to talk about some
facts around balanced and unbalanced forces.
Station 1: Cart w/ stick figure
• Take the cart and point it towards the black
barrier with the metal spring rod pointed
towards the barrier. Put the little stick figure
on the cart and give it a push.
Station 2: Penny on a card
• Put the index card on top of the cup and the
penny on top of the index card. Now flick the
card and record what happens below.
Now switch
• Those who had the car should now have
the cup and visa versa.
Now answer the following
questions
• What did you see the penny do?
• What did you see the Stick figure do?
• Why did the objects do this? & What does
this demonstrate?
• The penny was at rest and stayed at rest
• The stick figure was in motion and stayed
in motion
Now an illustration link
Galileo and Inertia
• In the 1600’s, the
Italian thinker
Galileo Galilei
stated that,
whether in motion
or at rest, every
object resists any
change to its
motion.
Inertia
• This resistance is
called inertia.
• Inertia is the
tendency of an
object to resist
any change in its
motion.
Sir Isaac Newton
• The English
Physicists Sir
Isaac Newton
restated
Galileo’s idea in
the first of his
three laws of
motion.
Please write this down
Newton’s 1st Law of Motion
• Newton’s first law of motion states
that an object at rest will remain at
rest and an object moving at
constant velocity will continue
moving at constant velocity unless
acted upon by an unbalanced force.
Law of Inertia
Mass and Inertia
• The
greater
the mass
(matter
in an
object)
of an
object,
the
greater
the
inertia.
The Bullet passes
through the fruit
but the majority of
the banana and the
apple stay in the
same place.
This is because
of their inertia
Net Force
Unbalanced Forces
• When there is a net
•
force acting on an
object, the forces are
said to be
unbalanced.
Unbalanced forces
acting on an object
will change the
object’s motion.
Unbalanced Forces
• Equal forces acting on
•
•
•
an object in opposite
directions are called
balanced forces.
Balanced forces acting
on an object will not
change the object’s
motion.
In other words an
object that isn’t
moving can still have
forces acting on it.
Balanced Forces