Transcript File

Forces
Newton’s 3
Laws
Action/
Reaction
Horse and
Carriage
Third Law
True/False
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1 ~ $100 Question
Definition of a force
1 ~ $100 Answer
A push or a pull
1 ~ $200 Question
Forces come in what?
1 ~ $200 Answer
1 ~ $300 Question
The two types of forces in an
interaction are the _______
and ______ forces.
1 ~ $300 Answer
Action and Reaction
1 ~ $400 Question
A mutual action between
objects
1 ~ $400 Answer
Interaction
1 ~ $500 Question
Action and reaction forces are
equal and opposite- why
don’t they cancel to zero?
1 ~ $500 Answer
They act on two different
bodies- they can only cancel
if they act on the same body
2 ~ $100 Question
Newton’s First Law of Motion
is considered the law of
_______.
2 ~ $100 Answer
Inertia
2 ~ $200 Question
Newton’s first law of motion
states that…..
2 ~ $200 Answer
An object at rest stays at rest
and an object in motion stays
in motion until a force acts
upon it.
2 ~ $300 Question
Newton’s second law of motion
deals with the relationship
between what three things?
2 ~ $300 Answer
Acceleration, Mass and Force
2 ~ $400 Question
As an ice skater pushes
harder with his leg muscles,
he begins to move faster.
This is an example of
Newton’s _____ law
because…
2 ~ $400 Answer
2nd Law because
acceleration and force are
directly proportional- the
more force you apply, the
more acceleration there is
2 ~ $500 Question
Using one of Newton’s 3
Laws, explain how a rocket
works.
2 ~ $500 Answer
Newton’s third law is action
and reaction- the action of
the gas leaving the bottom
of the rocket pushing down
towards earth then has the
reaction of the gas against
the rocket pushing the
rocket towards the sky.
3 ~ $100 Question
Newton’s third law of motion
states that for every _______
there is an equal and
opposite __________
3 ~ $100 Answer
Action/ Reaction
3 ~ $200 Question
Action forces and
reaction forces are
always what two
things?
3 ~ $200 Answer
Equal and opposite
3 ~ $300 Question
Rocketman’s rocket pushes
on the gas, and therefore
_____________, causing
Rocketman to accelerate.
3 ~ $300 Answer
the gas pushes on
Rocketman
3 ~ $400 Question
Explain the following: a small
car is completely totaled
when it crashes with a large
truck, and the truck only has
minor damages.
3 ~ $400 Answer
Newton’s third law says the
forces are equal and
opposite, yet the truck has
more mass, so the force has
less of an affect on the truck
3 ~ $500 Question
Explain the following
phenomena- The strongest
person on earth cannot exert
a 50N force on a tissue.
3 ~ $500 Answer
The forces MUST be equal
and opposite, so the force
exerted on the tissue can
only be as great as the force
the tissue can exert back.
4 ~ $100 Question
If the horse pulls the carriage
with 200N of force, the
carriage will pull the horse
with….
4 ~ $100 Answer
200N of force
4 ~ $200 Question
What are the two forces
acting on the carriage?
4 ~ $200 Answer
Pull and friction
4 ~ $300 Question
What equation would you
use to find the net force on
the carriage?
4 ~ $300 Answer
P (pull) – f (friction) =Net force
4 ~ $400 Question
Once the horse gets the cart
moving at the desired speed,
does the horse continue to
exert a force on the cart?
4 ~ $400 Answer
Yes but only enough to
overcome friction and air
resistance
4 ~ $500 Question
Using Newton’s 3rd Law, explain
why the horse is able to get the
carriage to accelerate
4 ~ $500 Answer
Even though the pull of the
horse on the carriage is equal
and opposite to the pull of the
carriage on the horse, the horse
also has the force of the ground
pushing back on the horse to
get the carriage to move
5 ~ $100 Question
State the short version of
Newton’s Third Law of
Motion
5 ~ $100 Answer
For every action there is an
equal and opposite reaction
5 ~ $200 Question
State the full version of
Newton’s Third Law of
Motion
5 ~ $200 Answer
Whenever one object exerts a
force on a second object, the
second object exerts an
equal and opposite force on
the first.
5 ~ $300 Question
Use Newton’s 3rd law to
explain why cannons (and
guns) recoil
5 ~ $300 Answer
The force of the cannon on
the cannonball is equal and
opposite the force of the
cannonball on the cannon.
Since the cannon has less
mass, the force is equal but
has less affect, causing it to
recoil slightly.
5 ~ $400 Question
Using Newton’s 3rd law,
explain why birds fly in a V
5 ~ $400 Answer
Birds wings push down on the
air, so the air pushes up on
them, which makes them fly.
But the air makes a vortex as
it pushes down on more air,
which gives the bird behind it
more uplift
5 ~ $500 Question
Use Newton’s 2nd law to
explain why the effects of the
forces (outcomes) in
rd
Newton’s 3 law depends on
the mass
5 ~ $500 Answer
Newton’s 2nd Law states that
acceleration is inversely
proportional to mass- the more
mass you have, the less
acceleration you have- the
more massive an object, the
less of an affect the force will
have
6 ~ $100 Question
Speed is the measurement
of distance traveled over a
period of time
6 ~ $100 Answer
True
6 ~ $200 Question
In a tug of war, the team that
wins is the team that pulls
hardest on the rope
6 ~ $200 Answer
False- the team that pushes
on the ground the most is the
team that will win
6 ~ $300 Question
It is the tires, not the road,
that pushes a car along
6 ~ $300 Answer
False- the tires push on the
road, and the road pushes
back in the opposite
direction, which is what
makes the car move foward
6 ~ $400 Question
You pull up on the earth with
just as much force as the
earth pulls down on you
(gravity)
6 ~ $400 Answer
True- the only reason it
doesn’t have an affect is
because the earth is much
more massive than you are
6 ~ $500 Question
Even though the
action/reaction forces are
equal and opposite, the net
force on B is not zero
6 ~ $500 Answer
False- the net force on B is
zero because the two feet
are acting on the one object
with equal and opposite
Identify 6 action/reaction
pairs of forces in the
following diagram
30 Seconds
Elephant on ground- ground on elephant
Elephant on rope- rope on elephant
Rope on man’s right, man on rope
Rope on man’s left, man on rope
Rope on tractor, tractor on rope
Tractor on ground, ground on tractor