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

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8th Grade Types of Interactions Classwork and Homework

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Classwork #1: Transfer of Forces

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1 Forces are pushes/pulls of an object. Explain at least 4 forces that we observe in nature.

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2 How are forces transferred without 2 objects being in contact?

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3 When an unbalanced force acts on an object, what affect does this have on the object?

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Homework: Transfer of Forces

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4 In your own words, differentiate between forces acting via direct contact and forces exerted via fields.

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5 Define the term “Field of Force” as it applies to the area of physics.

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6 List 2 types of forces that act through the use of a field.

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Classwork #2: Law of Gravitation

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7 Write a statement that summarizes Newton’s Universal Law of Gravitation.

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8 What is meant by the term “Universal Law”?

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9 What two factors affect the force of gravitation acting between two objects?

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10 What is the mathematical relationship between an

• bject’s mass, and the force of gravitation exerted

by that mass?

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11 What happens to the force of gravitation as distance away from the object is increased?

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12 Sketch a graph of Force of Gravitation (N) vs. Mass (kg) between any two objects.

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13 Sketch a graph of Force of Gravitation (N) vs. Distance of Separation (m) between any two

• bjects.

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Homework: Law of Gravitation

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14 In your own terms, explain why we can’t feel the force of gravitation exerted by objects such as people.

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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.

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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.

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17 Explain why the force of gravitation for Jupiter is greater than the Force of gravitation for the Moon.

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18 If the Earth mass doubled, your weight would _________________? Explain.

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19 If the Earth’s radius doubled, your weight would _______________? Explain.

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Classwork #3: Interactions between Electric Charges

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20 Define electric charge and list the two types of charge.

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21 What are the 3 particles that give matter electrical charge? List the charge of each particle.

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22 Explain the balance of electrons and protons in a neutral object.

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23 Explain the balance of charge in a negatively charged object.

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Homework: Interactions between Electric Charges

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24 Explain the balance of charge in a positively charged object.

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25 A charged balloon has a mixture of charge including +100 C and -200 C. What is the overall charge of the balloon?

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26 Who was the person who first used the terms “positive and negative” when referring to electricity?

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27 Define Electric charge.

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Classwork #4: Forces between Charges

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28 What is static cling?

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29 Define Coulomb’s Law.

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30 What type of force acts between like charges?

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31 What type of force acts between unlike charges?

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Homework: Forces between Charges

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32 What type of force acts between neutrally charged particles?

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33 As charge increases, what is the effect on the force between those charges?

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34 As charge decreases, what happens to the force between two objects?

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35 Sketch a graph of Electric Force (N) vs. Distance

• f Separation (m) between any two charged
• bjects.

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36 Differentiate between Newton’s Law of Gravitation and Coulomb’s Law. Draw a Venn Diagram to show their similarities and their differences.

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Classwork #5: Electric Fields

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37 Draw the field lines that exist between two unlike charges.

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38 Write the rules for drawing electric field lines.

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Homework: Electric Fields

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39 Draw the field that exists between 2 oppositely charged parallel plates. Explain the field that exists between these 2 objects

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40 What is the electric field around a neutrally charged object?

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Classwork #6: Magnetism

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41 What is magnetism?

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42 Explain William Gilbert’s idea about the Earth.

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43 What is a magnetic domain?

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44 Compare the orientation of magnetic domains in a)magnetized substances, and b) un-magnetized substances.

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Homework: Magnetism

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45 Compare/Contrast a Temporary Magnet and a Permanent magnet.

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46 What are the 3 ferromagnetic substances?

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47 Draw a sketch/label a basic electromagnet.

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48 What happens to the magnetism produced by an electromagnet when the electrical current is removed?

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Classwork #7: Magnetic Fields

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49 Sketch the magnetic field around a simple bar magnet.

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50 List the 3 basic rules for magnetic field lines.

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51 Explain the forces exerted between a) like magnetic poles, and b) unlike magnetic poles.

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Homework: Magnetic Fields

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52 Compare the field shapes between like charges

• vs. like magnetic poles. Why do they look the

same?

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53 Why does the south pole of a bar magnet point at the Earth’s South geographic pole?

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Classwork #8: Electromagnetic Interactions

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54 Describe the contributions of Hans Christian Oersted.

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55 Draw the magnetic field around a straight wire carrying a current.

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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?

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57 Describe the right hand rule.

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58 Draw the magnetic field around a coil.

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Homework: Electromagnetic Interactions

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59 Describe the left hand rule.

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60 Define induction.

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61 What happens when a bar magnet is forced through a looped wire?

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62 What happens when we pass the loop around a stationary bar magnet?

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63 Why is the relationship between electricity and magnetism so important to society?

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