Do Now 9.14.16 1. pencil How do you know if an object is unbalanced? What you need for class: 1. pencil 2. composition n.b. 3. textbook 4. homework How do you know if an object is unbalanced? If the net force calculated is 0 If there is no motion If the net force calculated is greater than 0 If the object is traveling at a constant velocity Reminder: be sure to update your T.O.C. daily and if you are absent to get missing assignments from student station

Do Now 9.15.16 1. pencil The best example of balanced forces is What you need for class: 1. pencil 2. composition n.b. 3. glue stick 4. scissors The best example of balanced forces is Car increasing speed Bus parked in a garage Ball kicked along a flat surface Roller coaster slowing down on an incline Reminder: be sure to update your T.O.C. daily and if you are absent to get missing assignments from student station

Do Now 9.16.16 1. pencil What you need for class: 2. composition n.b. 3. note: when you complete your bell ringer sheet please pass it to the front of your row and that person will place it in metal tray at student station An airplane is flying with a net force of zero. This means the airplane is Slowing down and losing altitude Moving at a constant speed and losing altitude Slowing down and traveling along a straight line Moving at a constant speed and traveling in a straight line Reminder: be sure to update your T.O.C. daily and if you are absent to get missing assignments from student station

Do Now 9.19.16 Two students are pushing a sofa across a room. What you need for class: 1. pencil 2. composition n.b. 3. new bell ringer paper on chair 4. Calculator What is the net force applied to the sofa by the students? 150 N 200 N 250 N 400 N Reminder: be sure to update your T.O.C. daily and if you are absent to get missing assignments from student station

F=MA foldable Flap 1: Force= Mass x Acceleration Flap 2: F=MA F= .42kgx 25 m/s² F= 10.5 N Flap 3: F=MA 20N= .5kg x A 20N/5kg= A Acceleration= 4 m/s² Flap 4: F=MA F= .300 kg x 4m/s² F= 4N Step 1: fold along dotted line Step 2: Cut along solid line for each flap Step 3: under each flap put the following information

Exit Ticket A force of 64N is applied to an 8kg mass. What is the acceleration of the mass? Solve. Show work and units. *first and last name & Class period

Acceleration 1. Emma Leopard 2. Kevin Marshall 3. Nixon Nataren 4. Marshall Robinson 5. Ashley Shumacher 6. Hal Seymour 7. Caylin Shuford 8. Madison Shuster 9. Jonathan Simmons 10.Shekinah Stokes 11.Tanner Tavano 12. Abby Thomas 13. Ceci Thomas 14. Megan Trent 15. Jolene Velazquez 16. Hannah Waterman 17. Bella Waters 18. Owen Wells 19. Jayla Williams 20. Nathan Williams 21.Brice Williamson 22. Emily Willis 23. Riley Wise 24. Brianna Wright 25. Carolyn Yonn

8th period Roller Coaster Ideas

Review Complete this assignment on pg. 24 in your science notebook Turn to page 361 in your textbook. 2.Define the vocabulary (4 terms) 3. Read pages 361-367 4. Copy & Answer the “check your reading” questions - ( 4 total)

Newton's Laws

Newton’s Contributions Calculus Light is composed of rainbow colors Reflecting Telescope Laws of Motion Theory of Gravitation

Newton’s First Law (law of inertia) An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force.

Equal forces in opposite directions produce no motion Balanced Force Equal forces in opposite directions produce no motion

Unequal opposing forces produce an unbalanced force Unbalanced Forces Unequal opposing forces produce an unbalanced force causing motion

If objects in motion tend to stay in motion, why don’t moving objects keep moving forever? Things don’t keep moving forever because there’s almost always an unbalanced force acting upon them. A book sliding across a table slows down and stops because of the force of friction. If you throw a ball upwards it will eventually slow down and fall because of the force of gravity.

Newton’s First Law (law of inertia) MASS is the measure of the amount of matter in an object. It is measured in Kilograms

Newton’s First Law (law of inertia) INERTIA is a property of an object that describes how ______________________ the motion of the object more _____ means more ____ much it will resist change to mass inertia

1st Law Unless acted upon by an unbalanced force, this golf ball would sit on the tee forever.

Friction! There are four main types of friction: What is this unbalanced force that acts on an object in motion? Friction! 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

1st Law Once airborne, unless acted on by an unbalanced force (gravity and air – fluid friction) it would never stop!

Inertia

Terminal Velocity

Friction and Inertia Foldable The resistance that one surface or object encounters when moving over another surface. Inertia: A tendency to do nothing or remain unchanged. Inertia is a property of matter. Examples: Book sitting on a shelf. Continuing to move when a car stops suddenly. 3. Leaning to the side as a vehicle quickly turns.

Newton’s Second Law Force equals mass times acceleration. F = ma

Newton’s Second Law 70 Newtons Force = Mass x Acceleration Force is measured in Newtons ACCELERATION of GRAVITY(Earth) = 9.8 m/s2 Weight (force) = mass x gravity (Earth) Moon’s gravity is 1/6 of the Earth’s If you weigh 420 Newtons on earth, what will you weigh on the Moon? 70 Newtons If your mass is 41.5Kg on Earth what is your mass on the Moon?

WEIGHT is a measure of the force of ________ on the mass of an object Newton’s Second Law WEIGHT is a measure of the force of ________ on the mass of an object measured in __________ gravity Newtons

Newton’s Second Law One rock weighs 5 Newtons. The other rock weighs 0.5 Newtons. How much more force will be required to accelerate the first rock at the same rate as the second rock? Ten times as much

For every action there is an equal and opposite reaction. Newton’s Third Law For every action there is an equal and opposite reaction.

Newton’s 3rd Law For every action there is an equal and opposite reaction. Book to earth Table to book

Think about it . . . What happens if you are standing on a skateboard or a slippery floor and push against a wall? You slide in the opposite direction (away from the wall), because you pushed on the wall but the wall pushed back on you with equal and opposite force. Why does it hurt so much when you stub your toe? When your toe exerts a force on a rock, the rock exerts an equal force back on your toe. The harder you hit your toe against it, the more force the rock exerts back on your toe (and the more your toe hurts).

Newton’s Third Law A bug with a mass of 5 grams flies into the windshield of a moving 1000kg bus. Which will have the most force? The bug on the bus The bus on the bug

Newton’s Third Law The force would be the same. Force (bug)= m x A Force (bus)= M x a Think I look bad? You should see the other guy!

Action and Reaction on Different Masses Consider you and the earth Action: earth pulls on you Reaction: you pull on earth

Action: tire pushes on road Reaction: road pushes on tire

Reaction: gases push on rocket Action: rocket pushes on gases

Consider hitting a baseball with a bat Consider hitting a baseball with a bat. If we call the force applied to the ball by the bat the action force, identify the reaction force. (a) the force applied to the bat by the hands (b) the force applied to the bat by the ball (c) the force the ball carries with it in flight (d) the centrifugal force in the swing (b) the force applied to the bat by the ball

Newton’s 3rd Law Suppose you are taking a space walk near the space shuttle, and your safety line breaks. How would you get back to the shuttle?

Newton’s 3rd Law The thing to do would be to take one of the tools from your tool belt and throw it is hard as you can directly away from the shuttle. Then, with the help of Newton's second and third laws, you will accelerate back towards the shuttle. As you throw the tool, you push against it, causing it to accelerate. At the same time, by Newton's third law, the tool is pushing back against you in the opposite direction, which causes you to accelerate back towards the shuttle, as desired.

What Laws are represented?

Review Newton’s First Law: Objects in motion tend to stay in motion and objects at rest tend to stay at rest unless acted upon by an unbalanced force. Newton’s Second Law: Force equals mass times acceleration (F = ma). Newton’s Third Law: For every action there is an equal and opposite reaction.

Newton's Laws 1stlaw: Homer is large and has much mass, therefore he has much inertia. Friction and gravity oppose his motion. 2nd law: Homer’s mass x 9.8 m/s/s equals his weight, which is a force. 3rd law: Homer pushes against the ground and it pushes back.