Do now 4/10

Do now 4/10Review: Write a hypothesis for the following problem: I want to know if using natural toothpaste makes my teeth white than using regular toothpaste.

Exam make-upsTomorrow after school in my roomGrades close Friday Science Fair Report draft is due written neatly by Friday April 13, 2012 Final draft due typed with display board no later than April 18th, 2012Science Fair is April 19-20th

Plan for this week:Tuesday: Science FairWednesday: Newtons 1st LawThursday: Newtons 2nd LawFriday- Science Fair draft due- work on display boards in classDO NOW 4/11

Anne drops a plastic fork and a metal fork of the same size and shape at the same time. Which one do you think will hit the ground first? Why? ANSWER IN TAG OR RECEIVE ZERO POINTS

Reminders Science fair report draft due Friday Grades close FridayMake up exam today at 3:45

Agenda

Do now 3 minNotes 5 minPractice notes 2 minActivities 10 minIp 5 minClosing 2 minTopic: Newtons 1st Law (Inertia)4 slides of notesWrite Questions as you go, I will give examples1ST LAW OF MOTION (LAW OF INERTIA)

Newtons 1st Law says that an object at rest will remain at rest and an object in motion will remain in motion unless an unbalanced force acts upon it.

Questions NotesWhat is Newtons 1st Law and how is it related to inertia?Newtons 1st Law says that an object at rest will remain at rest and an object in motion will remain in motion unless an unbalanced force acts upon it.

1ST LAWAlso known as the LAW OF INERTIA!Inertia: The resistance of any object to a change in its motion, whether its moving or not.More Mass = More InertiaLess Mass = Less Inertia

These pumpkins will not move unless acted on by an unbalanced force.

Questions NotesWhat is inertia and how is it related to mass?Inertia: The resistance of any object to a change in its motion, whether its moving or not.More Mass = More InertiaLess Mass = Less Inertia

1ST LAW examples

Golf Ball - once airborne it would never stop!

unless acted on by anunbalanced force (gravity and air fluid friction)

Questions NotesWhy does a golf ball hit into the air keep going if it has inertia?Once a golfball is n the air it would never stop unless another force acts on it- like gravity

1ST LAW

Unless acted upon by an unbalanced force, this golf ball would sit on the tee forever.

Questions NotesUnless acted upon by an unbalanced force, this golf ball would sit on the tee forever. 2 minutes practice notesNewtons 1st LawYou are driving in a car with no seat belt on. You see a family of ducks and slam on your brakes to avoid hitting them. Since you are not wearing your seat belt, you fly out of the car (remain in motion) until you hit the ground (an unbalanced force).

AHH! OuchIn motionAt restAnswer the following question with a partner at your table Be prepared to share when called on. (LIBRARY VOICES, 1 minute).

You are being chased through the wilderness by a gigantic elephant. The elephants mass would be threatening, however, if you zigzagged, the elephants mass would work to your advantage. Why is that? Explain using the word inertia.

Newtons Law ActivityYou have 7 minutes, at your table, in library voices.

Complete the activity at your table and answer the questions in COMPLETE SENTENCES

Newtons first law is working because it shows how an object can be affected by something else. That shows the part an object in motion stays in motion until acted on by an apposing force. The force of the washers pushing the other washers in the greater force in this quick experiment when you hit he washers against washers , they move . In newton's laws it says it wont move unless an object acts upon 1`it in this case The first stack of washers that is being flicked is a balanced force and the second stationary one is balanced. When one stack is flicked by your finger the applied force then makes it unbalanced and when the second stack is hit by the first one it also becomes unbalanced until gravity stops it.Our objects were at rest and remained at rest which relate to newton b/c the object will stay @ motion or @ rest unless any type of force is acted on itthe objects are moved determined by the force applied If something is at rest, it stays at rest/ in motion stays at motionThe amount of washers flicked is the amt that get replacedObjects are moved determined by force applied

Answer the following question with a partner at your table Be prepared to share when called on. (LIBRARY VOICES, 1 minute).If you slide a book across a table, it slides to a rest position. Use Newtons 1st Law to explain Why this happens 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.

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.) INDEPENDENT PRACTICESILENT AND ALONE OR RECEIVE A DETENTIONYOUR WORK MUST BE INITIALED BY ME BEFORE CLASS ENDSRead pages 80-81 until newtons second law and answer questions 15 and 16 on page 85Closing:Explain how Newtons 1st Law is demonstrated in the graphic below.

Do now 4/12Use Newtons First Law to explain the magic trick in this video. USE YOUR NOTES

Newtons First LawAn object at rest remains at rest, and an object in motion continues in motion with constant velocity (that is, constant speed in a straight line) unless the object experiences a net external force.

This is also known as the Law of Inertia.Agenda Do now (5 min)Notes (2 min)Whole Class Practice (15 min)Practice in groups (10 min)IP (10 min)Closing (5 min)Topic: Newtons 2nd Law (F=MA)* Force is equal to mass times acceleration

* An object will accelerate in the direction of any net force applied to it.

* The greater the force, the greater the acceleration.

* The greater the mass, the slower the acceleration.

* Or, simply put F=ma.Newtons Second LawThings move faster and farther when they are pushed harder.

Things move in the direction pushed unless another force changes the direction

Newtons Second Law, IOWF = maForce = Mass (Acceleration)Force= Newton Mass= kg Acceleration= (m/s2) (m/s/s)

Something with less mass needs less force to move!

Practice Problems:use wipe off sheetSmart car- Mass: 730 kg

Hummer- Mass: 2200 kg

How much force does it take to accelerate a hummer and a smart car 10m/s/s? Which requires less force?

Smart car- Mass: 730 kg

Hummer- Mass: 2200 kg

If you dont have a lot of money for gas (force) what car is the best option?

What is the force when something hits a 6kg object and accelerates it 7 m/s2?

42NWhat is the mass of a stroller if a little girl pushes it with a force of 10 Newtons and it accelerates 4 m/s2?2.5Kg

An automobile with a mass of 1000 kilograms accelerates when the traffic light turns green. If the net force on the car is 4000 Newtons, what is the cars acceleration?

4m/s/sA 100-kg crate, sliding on the floor, is brought to a stop by a 25-N force. What is the deceleration of the crate?

-0.25m/s/s

A football is kicked with a force of 15.5 N and accelerates at 36.1 m/s2 during the brief microseconds it is in contact with the kickers foot. What is the mass of the ball?

0.43 kg

A 45 kg kid goes down a half-pipe with an acceleration of 0.8m/s/s. What is the net force acting on him?

36N

An Olympic diver weighing 63.5 kg jumps off of the 30 meter board. She lands in the water at a acceleration of 5 m/s/s. What is the net force acting on her?

317.5N

Group practice 10 min

independent practice 10 min

Silent and alone or receive detention

Note: #5 Acceleration = final speed-start speed/ time

independent practice 10 min

Silent and alone or receive detention

Note: honors- skip #14 part c.# 13 should say 30 m/s/s not 30g

http://www.history.com/shows/the-universe/videos/beyond-the-big-bang-sir-isaac-newtons-law-of-gravityCLOSING

Describe F=MA in your own words. Use an example.Do now 4/13

What is the force required to move a 200kg elephant with an acceleration of 0.5m/s/s?

Please place report drafts in one pile on your table.

What is the force required to move a 200kg elephant with an acceleration of 0.5m/s/s?

F=ma

F=?m= 200a = 0.5

F=200 x 0.5 F = 100N

announcementsScience fair movedToday- Newtons 3rd LawagendaDo nowNotesPracticeIPJeopardyClosing/ collect do nows and reportsNewtons 3rd LawNewtons 3rd Law says that for every action force, there is an equal and opposite reaction force. Newtons 3rd LawThe key words here are equal and opposite. If you read in a situation that one thing is going up and the other down or one thing is going forwards and the other backwards, then it is talking about Newtons 3rd Law.Newtons 3rd Lawex: 1A fish pushes backwards on the water, and this propels his body forward.

Newtons 3rd Lawex: 2In a rocket ship, the expanding gases push fire and hot air downwards, and this propels the rocket upwards.

3RD LAWex: 3Example: 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.

Newtons 3rd Lawex: 4The baseball forces the bat to the left (an action); the bat forces the ball to the right (the reaction).

Newtons 3rd Lawex: 5Consider 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.

Newtons 3rd Lawex: 6

Flying gracefully through the air, birds depend on Newtons 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.Newtons 3rd LawDiscuss with a partner, library voices, 1 minute

How is this an example of Newtons 3rd law?

One minute library voices, with a partner, answer: Which player feels the most force in this demo? Why?

Wipe off boards!Share markers if you mustCheck For UnderstandingIf I am sitting in a chair with wheels, and I throw a giant cinder block in front of me (action), what will happen to me as I sit in the chair? (reaction)

a. The chair will stay in the same place.b. The chair will move backwards.Check For UnderstandingIf two people standing on skateboards push off of each other at the same time, what will happen?

a. Only the stronger person will move backwardsb. Both people will move backwards from each other.Check For UnderstandingAre there action-reaction forces happening when a book sits on a table?

A. Yesb. NoGroup practice:Jeopardy

Every group must answerGet double points if you get it correct when you choose the category and regular points when its not your turnDO NOT raise boards until I say goTalk in library voices with your groupWinning group gets 10 raffle tickets for each group member

INDEPENDENT PRACTICEYOU ARE WORKING SILENT AND ALONE

I MUST CHECK YOUR WORK BEFORE YOU MOVE ON TO CLOSINGClosing: Match each of Newtons Laws with its definition.

Column A Newtons 1st Law Newtons 2nd Law Newtons 3rd Law

Column Ba. F = mab. Every action has an equal and opposite reaction.c. An object at rest remains at rest and an object in motion stays at constant velocity unless it experiences and unbalanced force.

Closing: answers.

Newtons 1st Law:c. An object at rest remains at rest and an object in motion stays at constant velocity unless it experiences and unbalanced force.Newtons 2nd Law:F = maNewtons 3rd Law:b. Every action has an equal and opposite reaction.