Newton’s 3 Laws of Motion
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Transcript of Newton’s 3 Laws of Motion
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Newton’s 3 Laws of Motion
Abigail KruegerEDCI 270Project III
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Target Audience
10th – 11th grade high school studentsApproximately ages 15 – 17Previous experience required in basic
math, Algebra I
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Learning EnvironmentPreferred: classroom with computers,
students can ask teacher to clarify lesson if needed
Secondary: home computer with PowerPoint capability
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Objective 1
After learning Newton’s 1st Law of Motion, students will answer quiz question 1 with 100% accuracy.
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Objective 2
After learning Newton’s 2nd Law of Motion, students will answer quiz question 2 with 100% accuracy.
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Objective 3
After learning Newton’s 3rd Law of Motion, students will correctly identify one action-reaction pair in quiz question 3.
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Newton’s 3 Laws of Motion
The First Law
The Second Law
The Third Law
Take the Quiz!
Start Here!
References
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Why Learn About Motion?Motion is a part of
everything we do. Today, we’re going
to learn about three basic laws, which were discovered by this guy:
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Plus... It’s fun!
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Newton’s First Law of MotionWelcome to
Newton’s 1st Law of Motion! It’s time to learn about INERTIA. Later we will study his 2nd and 3rd laws.
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Law of InertiaThe law of inertia states that “an object in
motion will stay in motion, and an object at rest will stay at rest, unless acted upon by an outside force”.
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What does this mean?When you start
rolling a ball, it continues to roll. Hence why you sometimes have to chase it across the street.
Things that are stopped stay stopped. The ball doesn’t move until you push or kick it.
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Inertia ExampleQuestion:
If a car is speeding down the street and has no driver, does it stop at red lights?
Answer:NO. An object in motion will stay in motion. The car will continue to move unless someone hits the brakes.
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Law of InertiaNow that we’ve learned about Newton’s First
Law of Motion, it’s time to consider those “outside forces” that can change an object’s motion.
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The 2nd Law
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Newton’s Second Law of MotionYou should already know about inertia. Now it
is time to learn a little bit about forces before moving on to Newton’s 3rd Law.
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ForcesNewton’s 2nd Law is about the strength of
forces. This law is pretty intuitive. You already know that a large, heavy object is harder to lift than a smaller one. Now it is time to find out why this is true.
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ForcesNewton had an equation to find the numerical
value of a force.
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F = m x a
forcemass of the object
acceleration, or rate of change in motion
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Force UnitsForces: newtons (N)
Mass: kilograms (kg)
Acceleration: meters per second squared (m/s2)gravity = 9.8 m/s2
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Force ExampleTo solve for a force, you will be given a mass
an acceleration to multiply together.Question:
What force does a 65 kg person exert on the ground after falling off of a cliff, accelerating at 9.8 m/s2?
Answer:Force = 637 N
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ForcesNow you know that to change an object’s
motion you need to accelerate its mass with a certain force. Let’s learn about how forces interact with each other next.
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The 3rd Law
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Action-Reaction PairsNow that we’ve learned about how forces
change an object’s motion in Newton’s first and second laws, let’s move on to how forces interact with each other.
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Action-Reaction PairsNewton’s 3rd Law states that “for every action,
there is an equal an opposite reaction”.
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Action-Reaction PairsThink about it. When you lift something up
with a certain force, don’t you feel that object pushing back down on you?
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Examples of Action-ReactionPAIR: gravity and the normal force.
PAIR: you punch the wall, and the wall hurts your hand.
NOT a pair: your friend hits you and you hit him back.
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Take the Quiz!
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Now that you’ve learned a bit about Newton’s 3 Laws of Motion, it’s time to test your knowledge.
Start the Quiz!
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Question 1Which of these choices is an example of
inertia?A) you catch a flying ball
B) a car brakes to stop at a red light
C) a person falls through the air
D) after the skater gets off, a skateboard continues to roll
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Great job! The correct answer was (D).
You definitely know Newton’s 1st Law!
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Oops! That’s not quite right.Remember: “objects in motion stay in
motion”.
Hint: gravity exerts a force!
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Question 2Imagine your car runs out of gas. If it weighs
1500 kg, and you push it with a = .05 m/s2, what force are you pushing with?
A) 0 N
B) 75 N
C) 100 N
D) 50 N
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Good Job! The force you push with is 75 N.
Although whether you can actually push a car is another question entirely. ;)
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Oops! That’s not quite right.Remember: F = ma.
Check your math to make sure you did it right!
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Question 3Which of these choices is an action-reaction
pair?
A) gravity and the normal force
B) you punch your brother and he punches you back
C) you kick a ball and it moves forward
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Awesome! The normal force is the force that
opposes gravity.
You know your force pairs!
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Oops! That’s not quite right.These can be tricky!
Hint: the two forces must go in OPPOSITE directions.
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Congratulations!You’ve finished the quiz! You are now an
expert on Newton’s Laws of Motion.
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Sources: Newton’s Laws:
http://teachertech.rice.edu/Participants/louviere/Newton/ Images:
http://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/P_physics.svg/400px-P_physics.svg.png
http://www.aps.org/publications/apsnews/200908/images/Newton-cartoon-web.gif
http://www.timtim.com/public/images/drawings/large/Bike_Mailgirl.gif
http://wadeswords.files.wordpress.com/2010/03/isaac_newton_hd.jpg http://rt492.org/wl/img/inertia.gif
http://socialmediaseo.net/wp-content/uploads/2011/03/facebook-fan-page-newtons-law.jpg http://2.bp.blogspot.com/_1aTrKKEiz2A/SUhTSb0GYAI/AAAAAAAABVk/YIgn9AkYtE4/s320/3rd+law.gif
http://www.physicsclassroom.com/class/newtlaws/u2l4a13.gif
http://www.worsleyschool.net/science/files/inclined/diagram1.gif
http://www.simplywildcanada.com/images/face_question_mark.jpg
http://who-is-awesome.com/who-is-awesome.jpg
http://flyparsons.com/yahoo_site_admin/assets/images/grade_circled_a_plus_hg_clr.290142458_std.gif
http://thepirata.com/wp-content/uploads/2008/10/symbol_thumbs_up.png
http://blog.edelbioskincare.com/uploaded_images/happy-face-770659.png
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