By Robbin Carlton

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Newton's Laws of Motion
Sir Issac Newton

• By Robbin Carlton
• EDTC 6030

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The purpose of this lesson is to introduce you
to Newtons Three Laws of Motion.

• North Carolina Standard Course of Study
• 8th Grade Science
• Goal 4 The learner will build an understanding
  of motion and forces.
• Objective 4.07 Apply Newtons Laws of Motion to
  the way the world works
• Inertia
• Acceleration
• Gravitation
• Action/Reaction

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Newton's 1st Law of Motion
Newton's 2nd Law of Motion
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Newton's 3rd Law of Motion
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Newtons First Law of Motion
Every object in a state of uniform motion tends
to remain in that state of motion unless an
external force is applied to it. In other
words An object in motion tends to stay in
motion, and an object at rest tends to stay at
rest, unless the object is acted upon by an
outside force.
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A very common example of Newtons First Law of
Motion is what you experience when you are in a
fast moving vehicle that comes to an abrupt
stop. Lets say that you are driving down the
road at 60 mph and you are not wearing a seat
belt. Before you know it you have hit a cement
divider dead on. What you have to realize is
that not only is the car moving at 60 mph but
your are also moving at 60 mph. When the car
hits the divider it is stopped because an
outside force (cement divider) has acted upon
it. You are not so lucky because you were not
wearing a seat belt. So remember to buckle up!
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Lets say you arrived at school and realized that
you forgot your textbooks on the kitchen table.
When you arrive home that afternoon, unless an
outside force has moved them, they will be in
the same place.
When you kick a soccer ball it will continue
moving until it hits something. However, we know
that the ball will eventually stop even if it
does not hit a wall. This is due to friction
occurring between the ball and the ground as
well as between the ball and the air.
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Newtons Second Law of Motion
The relationship between an objects mass m, its
acceleration a, and the applied force F is Fma.
Acceleration and force are vectors (as
indicated by their symbols being displayed in
italics) in this law the direction of the force
vector is the same as the direction of the
acceleration vector.
FMA Force Mass multiplied by Acceleration
AF/M Acceleration Force divided by Mass
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How do we solve this problem? Force Mass X
Acceleration FMA So you just plug in your
answers. F ? M 2,000 kg A 0.05 m/s/s F2,000
kg X 0.05 m/s/s F 100 kgm/s/s Or 100 Newtons
Daniels van, which weighs 1,000 kg, is out of
gas. He is trying to push the car to the gas
station, and he makes the car go 0.05 m/s/s.
Using Newtons 2nd Law, you can computer how
much force Daniel is applying to the car.
(Hint since you are trying to find force use
the equation you just learned about).
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Newtons Third Law of Motion

• For every action there is an equal and opposite
  reaction.

Daniel gets tired of trying to push his van
to The gas station so he gets a bright idea and
puts On a pair of roller blades. He is thinking
that he Can go much faster with them on.
However, when he pushes on the van he starts
to Roll backwards. Hes confused because he
really Thought that this would help him move the
van Much faster. He has forgotten that for
every action (pushing on The van) there is an
equal and opposite reaction (the van pushes him).
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Check Your Understanding
Click on the button with your answer choice.

• You are riding your bicycle when you are brought
  to a stop by running into a hanging limb from a
  tree. The limb is an outside force that has
  acted upon you and the bicycle.
• What Law of Motion is this?
• A soccer ball that has been kicked will
  eventually stop due to
• Mikes car, which weighs 1,000 kg, is out of gas.
  He is pushing it to the gas station and he makes
  the car go 0.05 m/s/s. How much force is Mike
  applying to the car?
• The van weighs 2,000 kg and Daniel weighs 50 kg.
  If Daniel pushes the van how much will both he
  and the van move after 1 second? (hint AF/M)

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F
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Force
Friction
Mass
5 kgm/s/s
50 kgm/s/s
Daniel 2 meters, Van .05 meters
Daniel 1 meters, Van .10 meters
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Lesson
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Thats Right !
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Try Again !
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