Sir Isaac Newton was an English physicist and mathematician born in 1642 who made seminal contributions to the fields of natural philosophy, mathematics, astronomy, and optics. He is most famous for formulating the three laws of motion:
1) An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
2) The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
3) For every action, there is an equal and opposite reaction.
Newton
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Authorized Dukane/Convey Consultant
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A powerpoint i used for a STEM Presetation on using Dukane products with STEM( Science , Technology, Engineering and Math).
Bill McIntosh
SchoolVision Inc ( my consulting company)
Authorized Dukane/Convey Consultant
Phone :843-442-8888
Email :WKMcIntosh@Comcast.net
Twitter : @OtisTMcIntosh
SchoolVision Website on Facebook: https://www.facebook.com/WKMIII
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1. Sir Isaac Newton?
English
Physicist and
Mathematici
an. 1642 -
1727
INFLUENCED
FIELDS
Natural
Philosophy
Mathematics
Astronomy
Alchemy
Christian
Theology
He
formulated
the Three
LAWS OF
MOTION
2. INVESTIGATING INERTIA
Coin Drop
Q9. What happens when you slowly
pulled the cardboard? Explain.
Q10. What happens when you
flicked the cardboard? Explain.
Stack of Coins
Q11. What happens when you hit the
coin at the bottom? Why is this
3. 1st Law
Inertia is the
tendency of an
object to resist
changes in its
velocity:
whether in
motion or
motionless. These pumpkins will not move unless acted on
by an unbalanced force.
4. 1st Law
Once airborne,
unless acted
on by an
unbalanced
force (gravity
and air – fluid
friction), it
would never
stop!
5. 1st Law
Unless acted
upon by an
unbalanced
force, this golf
ball would sit
on the tee
forever.
6. Why then, do we observe
every day objects in motion
slowing down and becoming
motionless seemingly without
an outside force?
It’s a force we sometimes cannot see –
friction.
7. Objects on earth, unlike the
frictionless space the moon
travels through, are under the
influence of friction.
8. There are four main types of friction:
Sliding friction: ice skating
Rolling friction: bowling
Fluid friction (air or liquid): air or water resistance
Static friction: initial friction when moving an object
What is this unbalanced force that acts on an object in motion?
9. Slide a book
across a table and
watch it slide to a rest
position. The book
comes to a rest
because of the
presence of a force -
that force being the
force of friction -
which brings the book
to a rest position.
10. In the absence of a force of friction, the book
would continue in motion with the same speed
and direction - forever! (Or at least to the end
of the table top.)
11. Newtons’s 1st Law and You
Don’t let this be you. Wear seat belts.
Because of inertia, objects (including you) resist changes in
their motion. When the car going 80 km/hour is stopped by
the brick wall, your body keeps moving at 80 m/hour.
13. 2nd Law
The net force of an object is
equal to the product of its
mass and acceleration, or
F=ma.
14. 2nd Law
When mass is in kilograms and acceleration is
in m/s/s, the unit of force is in newtons (N).
One newton is equal to the force required to
accelerate one kilogram of mass at one
meter/second/second.
15. 2nd Law (F = m x a)
How much force is needed to accelerate a
1400 kilogram car 2 meters per second/per
second?
Write the formula
F = m x a
Fill in given numbers and units
F = 1400 kg x 2 meters per second/second
Solve for the unknown
2800 kg-meters/second/second or 2800 N
16. If mass remains constant, doubling the acceleration, doubles the force. If force remains
constant, doubling the mass, halves the acceleration.
17. Newton’s 2nd Law proves that different masses
accelerate to the earth at the same rate, but with
different forces.
• We know that objects
with different masses
accelerate to the
ground at the same
rate.
• However, because of
the 2nd Law we know
that they don’t hit the
ground with the same
force.
F = ma
98 N = 10 kg x 9.8 m/s/s
F = ma
9.8 N = 1 kg x 9.8 m/s/s
18.
19. Check Your Understanding
1. What acceleration will result when a 12 N net force applied to a 3
kg object? A 6 kg object?
2. A net force of 16 N causes a mass to accelerate at a rate of 5
m/s2. Determine the mass.
3. How much force is needed to accelerate a 66 kg skier 1
m/sec/sec?
4. What is the force on a 1000 kg elevator that is falling freely at 9.8
m/sec/sec?
20. Check Your Understanding
1. What acceleration will result when a 12 N net force applied to a 3 kg
object?
12 N = 3 kg x 4 m/s/s
2. A net force of 16 N causes a mass to accelerate at a rate of 5 m/s2.
Determine the mass.
16 N = 3.2 kg x 5 m/s/s
3. How much force is needed to accelerate a 66 kg skier 1 m/sec/sec?
66 kg-m/sec/sec or 66 N
4. What is the force on a 1000 kg elevator that is falling freely at 9.8
m/sec/sec?
9800 kg-m/sec/sec or 9800 N
21. Gravity acts on all objects on the earth’s
surface and causes them to accelerate when
released. This acceleration, known as the
acceleration due to gravity g, is the same for
all objects on earth and is equal 9.8 m/s2. This
means that when objects fall, their velocities
increase by 9.8 m/s every 1 second.
22. 1s
2s
3s
Initial speed = 0
On a freely
falling body,
9.8m/s is added
to the velocity of
the ball in each
second
9.8m/s
19.6m/s
29.4m/s
Initial speed = 25m/s
34.8m/s
44.6m/s
54.4m/s
23. Try to whirl an object tied to a string
horizontally above your head. Then observe
what happens if you release the object. How
does it travel after release?
25. 3rd Law
According to Newton,
whenever objects A
and B interact with
each other, they exert
forces upon each
other. When you sit in
your chair, your body
exerts a downward
force on the chair and
the chair exerts an
upward force on your
body.
26. 3rd Law
There are two forces
resulting from this
interaction - a force
on the chair and a
force on your body.
These two forces are
called action and
reaction forces.
27. Newton’s 3rd Law in Nature
Consider the propulsion
of a fish through the
water. A fish uses its fins
to push water backwards.
In turn, the water reacts
by pushing the fish
forwards, propelling the
fish through the water.
The size of the force on
the water equals the size
of the force on the fish;
the direction of the force
on the water (backwards)
is opposite the direction
of the force on the fish
(forwards).
28. 3rd Law
Flying gracefully
through the air, birds
depend on Newton’s
third law of motion. As
the birds push down on
the air with their wings,
the air pushes their
wings up and gives
them lift.
29. Consider the flying motion of birds. A bird flies
by use of its wings. The wings of a bird push air
downwards. In turn, the air reacts by pushing
the bird upwards.
The size of the force on the air equals the size
of the force on the bird; the direction of the force
on the air (downwards) is opposite the direction
of the force on the bird (upwards).
Action-reaction force pairs make it possible for
birds to fly.
30.
31. Other examples of Newton’s Third Law
The baseball forces
the bat to the left (an
action); the bat forces
the ball to the right
(the reaction).
32. 3rd Law
Consider the motion
of a car on the way to
school. A car is
equipped with wheels
which spin
backwards. As the
wheels spin
backwards, they grip
the road and push the
road backwards.
33. 3rd Law
The reaction of a rocket is
an application of the third
law of motion. Various
fuels are burned in the
engine, producing hot
gases.
The hot gases push against
the inside tube of the rocket
and escape out the bottom
of the tube. As the gases
move downward, the rocket
moves in the opposite
direction.