January 20, Aims: Agenda. SWBAT define and identify field forces.

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1 January 20, 2017 Aims: SWBAT define and identify field forces. Agenda 1. Do Now 2. Class Notes 3. Guided Practice 4. Independent Practice 5. Practicing our AIMS: Homework: F.9 Field Forces How will you help our class earn all of our S.T.R.I.V.E. Points? 100% HW Club.you in?!?! 1

2 Aim Check: 2

3 SCIENCE 8 Field Forces F.9 Name: Date: Homeroom: Forces Telekinesis, wingardium leviosia, the force ALL SCIENCE! OBJECTIVES: By the end of class, students will be able to SWBAT define and identify field forces. DO NOW Directions: Read and ANNOTATE the question before you solve the problem. Directions: Grade the provided constructed responses for the following question. Two objects fall near Earth s surface. One object s mass is 100 kg, and the other object s mass is 10 kg. Ignore air resistance. Explain why the gravitational forces acting on the objects are different. Explain why the acceleration of the objects are the same. (2 points) The forces acting on the objects are different because the two objects have different masses. The accelerations of the objects are the same because of the gravitational pull of 9.8 m/s. 1. This response earns of the 2 points because If two objects are falling to the earth with different masses have different gravitational forces because gravity pulls down on an objects by its mass, the more mass the more force applied. The accelerations of the objects are the same because when there is no air resistance so the only vertical force applied is gravity which causes a constant acceleration rate of 9.8m/s This response earns of the 2 points because The 100kg object would have more gravity pulling it down the acceleration would be quicker on the 100kg because it has more gravity. 3. This response earns of the 2 points because 3

TYPES OF FORCES CLASS NOTES CONTACT FORCES: FIELD FORCES: APPLIED FORCE: applied by another object NORMAL FORCE: perpendicular to surface of contact FRICTIONAL FORCE: opposes motion AIR RESISTANCE

4 TYPES OF FORCES CLASS NOTES CONTACT FORCES: FIELD FORCES: APPLIED FORCE: applied by another object NORMAL FORCE: perpendicular to surface of contact FRICTIONAL FORCE: opposes motion AIR RESISTANCE FORCE: frictional force of air EXAMPLE Disclaimer: While the analogy below is silly, it is useful in describing the nature of a field force! Anyone who has ever walked into a room of an infant with a poopy diaper has experienced a There is something about the space surrounding a poopy diaper that exerts an upon other people who enter that space. When you walk into a room with such a diaper present, your detectors begin to detect the presence of a stinky field. As you move to the infant, the stinky field becomes The of the poo in the diaper, the the stinky field. It's not difficult to imagine that a poopy diaper could exert a smelly influence some distance away that would any nose that gets in that area. The diaper has altered the nature of the surrounding space and when your nose gets near, you know it. The stinky diaper has created a stinky field force. 4

GRAVITATIONAL FORCE: Real World Example: The sun and planets exert a on each other even though they are millions of

Even when your feet leave the earth and you are no longer in with the earth, there is a between you and the Earth.

As you move towards an object, the gravitational field becomes The of the object, the the gravitational field.

5 GRAVITATIONAL FORCE: Real World Example: The sun and planets exert a on each other even though they are millions of kilometers apart. Even when your feet leave the earth and you are no longer in with the earth, there is a between you and the Earth. This field force is responsible for keeping all the planets in their orbit around the sun. As you move towards an object, the gravitational field becomes The of the object, the the gravitational field. ELECTRICAL FORCE: Electrostatics is all about Some materials have special properties of developing charge on their surface. These materials then and away. towards them As you move becomes towards an object, the electrical field The of the object, the the electrical field. 5

6 MAGNETIC FORCE: This is a field force because there is between the materials. This force is due to the magnetic field developed around the magnet. These magnets have two poles called Like poles Unlike poles As you move towards an object, the magnetic field becomes The of the object, the the magnetic field. NUCLEAR FORCE: They are also called field forces because they act between particles. Like charges Unlike charge As you move towards an object, the nuclear field becomes The of the object, the the nuclear field. 6

7 WE DO: Guided Practice Directions: Determine if the force is a contact or field force. Then, identify which specific push or pull is being described. Use ICE and key terms to support your reasoning. 1. Apple falling down from the tree. 2. Iron pins being attracted when in the area of a magnet without any physical contact. 3. Hair with a negative charge will attract positive paper bits towards it. 4. A foot kicking a soccer ball. 5. Falling of raindrops onto earth. 7

8 YOU DO: Independent Practice Directions: For each key term, explain the big idea to a kindergartener. Then, draw a picture to illustrate the word. Term Concept Picture CONTACT FORCE FIELD FORCE Directions: Determine if the force is a contact or field force. Then, identify which specific push or pull is being described. Use ICE and key terms to support your reasoning. 1. Fall of feather towards earth. 2. Protons staying in the nucleus of an atom. 3. Two magnetic north poles are close to each other. The magnets move away from each other. 8

9 Directions: Compare and contrast contact and field forces by filling out the Venn diagram below using the phrase bank. Contact Forces Both Field Forces Push or pull Acts on an object at a distance Can cause motion Friction Electric force Magnetic force PHRASE BANK Must touch an object Gravity Applied force Air resistance Normal force Nuclear force 9

10 BEAST MODE: Challenge Accepted! 10

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IN THE REAL WORLD Star Wars force fields are possible using powerful magnets but we can't see through them By Cez Verzosa, Tech Times May 7, 2014 While science fiction does not bother to explain how

14 IN THE REAL WORLD Star Wars force fields are possible using powerful magnets but we can't see through them By Cez Verzosa, Tech Times May 7, 2014 While science fiction does not bother to explain how such weird yet amazing phenomenon occurs as long as we enjoy the thrill of it, a group of researchers at the University of Leicester went out of their way to investigate if the shields are scientifically possible. They discovered that with the help of powerful magnets, the force field used to protect battleships including X-Wing and TIE fighters from the enemies' laser cannon fires and blasters can be recreated. In fact, a Star Wars-like shield already exists here on Earth-the three fourth year physics majors said-in the form of ionosphere. The upper layer of the Earth's atmosphere, ionosphere is a sheet of plasma (electrically charged air) that helps in worldwide radio communications by "bouncing off" any radio frequency shot at the atmosphere back to Earth, a principle that is similar to the deflector shields used to protect the Death Star battle stations of the Galactic Empire, with theirs only hundred times more powerful. Considering this noticeable and long-existing physics, the researchers proposed that a field of super-hot plasma charged with electricity could be used, but a powerful magnetic field must also be involved to hold the plasma's high energy. Here comes the best part. Getting the required magnetic strength is possible, the researchers claimed, as chunks of powerful magnets that can produce huge amounts of magnetism are now used in medical technology. However, a gigantic power source is needed to produce an effective force field and that would be quite unworkable for tiny spaceships such as X-Wing. In the same way the field could deflect the light blasted by the enemies, pilots manning the Starfighters blanketed by the proposed shield may not see anything outside-hence, they become blind. Lucky for pilots like Luke Skywalker, he has The Force to guide him. What about the other pilots? There is a remedy, suggested the researchers. Pilots should use an Ultra-Violet camera as ultraviolet rays travel far beyond the normal The proposed technology, which was published in the Journal of Special Physics Topics, may not be enough to safeguard Starfighters in our own galaxy but Alexander Toothie, one of the researchers, said the study can lead to other future discoveries and more reasonable technology. "Another possible application of this principle may be for trapping radiation inside a shell of plasma rather than excluding it. This may be useful for applications that require incredibly high temperature environments, such as experimental fusion reactors," he said. 14

Science 8 Name: SKILL SNAPSHOT Date: F.8: Force Body Diagram Homeroom: Quick Notes: Read and ANNOTATE the information before you solve the problem. Like A Scholar? Yes No Redo?

15 Science 8 Name: SKILL SNAPSHOT Date: F.8: Force Body Diagram Homeroom: Quick Notes: Read and ANNOTATE the information before you solve the problem. Like A Scholar? Yes No Redo? Yes No Directions: Determine if the force is a contact or field force. Then, identify which specific push or pull is being described. Use ICE and key terms to support your reasoning. 1. A paper clip sliding towards a magnet. 2. A bat striking a baseball. 3. A positively-charged ion bonding with a negatively-charged ion. 4. The moon orbiting the Earth. 15

Directions: The statements describing the image of seafloor spreading below are incorrect. Rewrite each statement about FORCES to make it correct. Then, explain your correction.

16 Directions: The statements describing the image of seafloor spreading below are incorrect. Rewrite each statement about FORCES to make it correct. Then, explain your correction. Hint: The problem is within the underlined phrases! 5. The magnetic reversal stripes seen at a mid-ocean ridge is caused by the Earth s magnetic contact force pushing minerals to line up with the magnetic north pole. Correction: Explanation: 6. A divergent boundary is caused by the field force of the asthenosphere in contact with the lithosphere pulling on the tectonic plates. Correction: Explanation: 16

January 25, Aims: Agenda. SWBAT explain how electric fields are created

January 25, Aims: Agenda. SWBAT explain how electric fields are created January 25, 2017 Aims: SWBAT explain how electric fields are created Agenda 1. Do Now 2. Class Notes 3. Guided Practice 4. Independent Practice 5. Practicing our AIMS: Homework: F.12 Electric Charges How