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# Homework (physics)

## Textbook homework

### Chapter 14 Waves

2/13: Read Glencoe Physics, Chapter 14 Vibrations and Waves, Section 2, Wave properties. Study the example problem on age 392 (Characteristics of a wave) Following this exact format, do practice problems #15-20, and #25

2/27: Lab report waves/sound: You must follow our Lab report format!
Diagrams (show how the rope is connected to a chair – and carefully draw standing waves – 1st, 2nd and 3rd harmonics)

Data analysis (calculations) section: Give two examples of the musical notes you analyzed, and the frequencies you measured. Assuming that the speed of sound in air is 343 meters/second, calculate the wavelength of two different musical notes. Start with the correct equation, solve for the variable that you need, and plug in numbers only in the last step.

Data table
Tuning fork 1      freq   sound intensity (loudness)
Tuning fork 2     freq    sound intensity (loudness)
Singing glass 1   freq    sound intensity (loudness)
Singing glass 2  freq    sound intensity (loudness)

Systematic error: make sure to briefly include this section.

(1) How many wavelengths is in the 1st harmonic? In the 2nd, 3rd and 4th?

(2) What is a general formula that relates wavelengths to harmonics?

(3) In complete sentences, clearly write what you learned about the tuning fork’s sound intensity, tone, and wave shape.

(4) In complete sentences, clearly write what you learned about the instrument’s sound intensity, tone, and wave shape.

3/1: Read Glencoe Physics, Chapter 14 Vibrations and Waves, Section 3.
Do Chap 14 assessment questions #52, 57, 60, 62, 66, 72, 78, 84

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### Chapter 16 Fundamentals of Light

3/9/17: Read Chap 16, p.438-440, & 448-450. Define all the vocabulary terms, in your notebook.

3/13 Assessment questions. p.458-460.  #44, 45, 51, 65, 67, 81
CPO Skill Sheet 17.1A The law of reflection (2 pages)

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### Chapter 17 Reflection and Mirrors

3/23/17: Homework: Read Chap. 17 Reflection and Mirrors. |
Section 1, p.464-470. Section 2, 471-476
Do #23, p.481, #23.
Be able to explain these terms

Law of reflection. Specular & Diffuse reflection.
Plane mirror. Object. Real & Virtual image.
Converging and diverging rays.
Concave and convex mirrors.
Concave and convex lenses.
Principal axis. Focal point. Focal length.
Spherical aberration.

3/27 Review packet: Draw and solve 8 problems: Linear motion with, and without acceleration;  circular motion; waves and light.  Follow the six noted steps for each problem. Problems include sig figs, metric conversions, sci. notation, and dimensional analysis.

3/29 Study for our upcoming exam on: Waves, Light, Kinematics, significant figures, metric conversions, scientific notation, isolating a variable and dimensional analysis.

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Chapter 18: Refraction and lenses

Read Section 1, pages 492, 497, 498-499.
Read Section 2, pages 500-503, 506.
Do p.507 # 21, 22,25, 28.
Do p.511, #33, 34, 36
Do. p.516 #80, #82 – Hint: light refracts! Hint: We normally can’t see all the way
across the ocean because the Earth’s surface is curved.
Hint: Check out the ‘Light’ articles on our website.

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Chapter 20: Static Electricity

Read Section 1, Electric charge. Write a section summary in your notebook.

(a) What is electrostatics? How do we know that there is an electrostatic force?
(b) What did we learn about two objects with like charges?
(c) What did we learn about objects with unlike charges?
(d) What did we learn about types of charges?
(e) A microscopic view of charge: What did we learn about charges in a neutral object?
(f) What does it mean when we say that there is a transfer of electrons?
(g) Explain what is occurring in Figure 4 (wool rug to rubber soled shoe)
(h) What is an electrical conductor? What is an electrical insulator?

Read Section 2, Electrostatic force. Write a section summary in your notebook.
Note: We use the letter q as shorthand for “electric charge.”

(a) In complete sentences, with simple hand-drawn pictures, summarize how electric charges create forces.
(b) Explain what is happening in figure 8 (the electroscope)
(c) Explain what is happening in figure 10 (charging a metal sphere by induction)
(d) Explain what is happening in figure 11 (grounding the electroscope)
(e) What was Charles Coulomb trying to measure? What did he discover about the strength of electric charges, when they put a force on each other? (how does force relate to distance?)
(f) What did Coulomb discover about the strength of the force, in terms of qa and qb (that’s just shorthand for two charged objects that are near each other)
(g) A Coulomb is the metric unit of electric charge: How many protons, or electrons, would we need to make one Coulomb?
(h) What is the formula Coulomb discovered, that let’s us find how strongly 2 charged particles affect each other?
(i) What are some applications of electrostatic forces?

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Chapter 21 Electric fields

and our website Electrostatics

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Chapter 22 Electric Current

and our website electric current

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Chapter 23 Series and Parallel Circuits

and our website electrical current

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Chapter 24 Magnetic fields

compasses, the Earth’s poles, how magnets work, and the magnetic field.

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Chapter 26 Electromagnetism