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

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!

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!

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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