8th Grade Types of Interactions Classwork and Homework - PDF document

Slide 1 / 81 New Jersey Center for Teaching and Learning Progressive Science Initiative This material is made freely available at www.njctl.org and is intended for the non-commercial use of students and teachers. These materials may not be used for any commercial purpose without the written permission of the owners. NJCTL maintains its website for the convenience of teachers who wish to make their work available to other teachers, participate in a virtual professional learning community, and/or provide access to course materials to parents, students and others. Click to go to website: www.njctl.org Slide 2 / 81 8th Grade Types of Interactions Classwork and Homework www.njctl.org Slide 3 / 81 Classwork #1: Transfer of Forces

Slide 4 / 81 1 Forces are pushes/pulls of an object. Explain at least 4 forces that we observe in nature. Slide 5 / 81 2 How are forces transferred without 2 objects being in contact? Slide 6 / 81 3 When an unbalanced force acts on an object, what affect does this have on the object?

Slide 7 / 81 Homework: Transfer of Forces Slide 8 / 81 4 In your own words, differentiate between forces acting via direct contact and forces exerted via fields. Slide 9 / 81 5 Define the term “Field of Force” as it applies to the area of physics.

Slide 10 / 81 6 List 2 types of forces that act through the use of a field. Slide 11 / 81 Classwork #2: Law of Gravitation Slide 12 / 81 7 Write a statement that summarizes Newton’s Universal Law of Gravitation.

Slide 13 / 81 8 What is meant by the term “Universal Law”? Slide 14 / 81 9 What two factors affect the force of gravitation acting between two objects? Slide 15 / 81 10 What is the mathematical relationship between an object’s mass, and the force of gravitation exerted by that mass?

Slide 16 / 81 11 What happens to the force of gravitation as distance away from the object is increased? Slide 17 / 81 12 Sketch a graph of Force of Gravitation (N) vs. Mass (kg) between any two objects. Slide 18 / 81 13 Sketch a graph of Force of Gravitation (N) vs. Distance of Separation (m) between any two objects.

Slide 19 / 81 Homework: Law of Gravitation Slide 20 / 81 14 In your own terms, explain why we can’t feel the force of gravitation exerted by objects such as people. Slide 21 / 81 15 Draw a sketch of the gravitational field surrounding an object such as the Earth, and explain why the field lines diverge (spread out) as we move away from the surface of the planet.

Slide 22 / 81 16 Explain why the field lines point inward toward a mass when we draw a gravitational field line diagram around an object such as planet Earth. Slide 23 / 81 17 Explain why the force of gravitation for Jupiter is greater than the Force of gravitation for the Moon. Slide 24 / 81 18 If the Earth mass doubled, your weight would _________________? Explain.

Slide 25 / 81 19 If the Earth’s radius doubled, your weight would _______________? Explain. Slide 26 / 81 Classwork #3: Interactions between Electric Charges Slide 27 / 81 20 Define electric charge and list the two types of charge.

Slide 28 / 81 21 What are the 3 particles that give matter electrical charge? List the charge of each particle. Slide 29 / 81 22 Explain the balance of electrons and protons in a neutral object. Slide 30 / 81 23 Explain the balance of charge in a negatively charged object.

Slide 31 / 81 Homework: Interactions between Electric Charges Slide 32 / 81 24 Explain the balance of charge in a positively charged object. Slide 33 / 81 25 A charged balloon has a mixture of charge including +100 C and -200 C. What is the overall charge of the balloon?

Slide 34 / 81 26 Who was the person who first used the terms “positive and negative” when referring to electricity? Slide 35 / 81 27 Define Electric charge. Slide 36 / 81 Classwork #4: Forces between Charges

Slide 37 / 81 28 What is static cling? Slide 38 / 81 29 Define Coulomb’s Law. Slide 39 / 81 30 What type of force acts between like charges?

Slide 40 / 81 31 What type of force acts between unlike charges? Slide 41 / 81 Homework: Forces between Charges Slide 42 / 81 32 What type of force acts between neutrally charged particles?

Slide 43 / 81 33 As charge increases, what is the effect on the force between those charges? Slide 44 / 81 34 As charge decreases, what happens to the force between two objects? Slide 45 / 81 35 Sketch a graph of Electric Force (N) vs. Distance of Separation (m) between any two charged objects.

Slide 46 / 81 36 Differentiate between Newton’s Law of Gravitation and Coulomb’s Law. Draw a Venn Diagram to show their similarities and their differences. Slide 47 / 81 Classwork #5: Electric Fields Slide 48 / 81 37 Draw the field lines that exist between two unlike charges.

Slide 49 / 81 38 Write the rules for drawing electric field lines. Slide 50 / 81 Homework: Electric Fields Slide 51 / 81 39 Draw the field that exists between 2 oppositely charged parallel plates. Explain the field that exists between these 2 objects

Slide 52 / 81 40 What is the electric field around a neutrally charged object? Slide 53 / 81 Classwork #6: Magnetism Slide 54 / 81 41 What is magnetism?

Slide 55 / 81 42 Explain William Gilbert’s idea about the Earth. Slide 56 / 81 43 What is a magnetic domain? Slide 57 / 81 44 Compare the orientation of magnetic domains in a)magnetized substances, and b) un-magnetized substances.

Slide 58 / 81 Homework: Magnetism Slide 59 / 81 45 Compare/Contrast a Temporary Magnet and a Permanent magnet. Slide 60 / 81 46 What are the 3 ferromagnetic substances?

Slide 61 / 81 47 Draw a sketch/label a basic electromagnet. Slide 62 / 81 48 What happens to the magnetism produced by an electromagnet when the electrical current is removed? Slide 63 / 81 Classwork #7: Magnetic Fields

Slide 64 / 81 49 Sketch the magnetic field around a simple bar magnet. Slide 65 / 81 50 List the 3 basic rules for magnetic field lines. Slide 66 / 81 51 Explain the forces exerted between a) like magnetic poles, and b) unlike magnetic poles.

Slide 67 / 81 Homework: Magnetic Fields Slide 68 / 81 52 Compare the field shapes between like charges vs. like magnetic poles. Why do they look the same? Slide 69 / 81 53 Why does the south pole of a bar magnet point at the Earth’s South geographic pole?

Slide 70 / 81 Classwork #8: Electromagnetic Interactions Slide 71 / 81 54 Describe the contributions of Hans Christian Oersted. Slide 72 / 81 55 Draw the magnetic field around a straight wire carrying a current.

Slide 73 / 81 56 What happens to the strength of a magnetic field around a wire when a) current is increased, and b) when we move away from the current carrying wire? Slide 74 / 81 57 Describe the right hand rule. Slide 75 / 81 58 Draw the magnetic field around a coil.

Slide 76 / 81 Homework: Electromagnetic Interactions Slide 77 / 81 59 Describe the left hand rule. Slide 78 / 81 60 Define induction.

Slide 79 / 81 61 What happens when a bar magnet is forced through a looped wire? Slide 80 / 81 62 What happens when we pass the loop around a stationary bar magnet? Slide 81 / 81 63 Why is the relationship between electricity and magnetism so important to society?