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Physics
for CSEC? Examinations 3rd Edition
Alec Farley and Clarence Trotz Series Editor: Dr Mike Taylor
CSEC? is a registered trade mark of the Caribbean Examinations Council (CXC). PHYSICS FOR CSEC? EXAMINATIONS THIRD EDITION is an independent publication and has not been authorised, sponsored, or otherwise approved by CXC.
Macmillan Education 4 Crinan Street, London, N1 9XW A division of Macmillan Publishers Limited
Companies and representatives throughout the world.
macmillan-
ISBN 978-0-230-47947-0 AER
Text ? Alec Farley & Clarence Trotz 2014 Design and illustration ? Macmillan Publishers Limited 2014 The authors have asserted their rights to be identified as the authors of this work in accordance with the Copyright, Design and Patents Act 1988.
This edition published 2014 First edition published 2007
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Contents
Series preface
vii
About this book
viii
Introduction: Measurement
1 Section A: Mechanics
51
1 Physical Quantities and Units
2 4 Galileo Galilei and the Simple Pendulum
52
Introduction
2
Galileo Galilei ? what was his contribution to scientific
Physical quantities
2
methodology?
53
Units for fundamental quantities
3
What is a `simple' pendulum?
53
Multiple and sub-multiple units
4
Chapter summary
62
Derived quantities
6
Answers to ITQs
62
Units named after famous scientists
6
Examination-style questions
63
Chapter summary Answers to ITQs Examination-style questions
9 5 Combining and Resolving Vectors
64
9 9
Scalars and vectors Resolving a vector into two components
64 72
2 Precision, Accuracy and Significance
10
Chapter summary
73
Introduction
10
Answers to ITQs
74
What is meant by `a satisfactory result'?
11
Examination-style questions
74
Precision Degree of significance of a result of a calculation
11 14
6
Forces How various forces are produced
75 75
Types of instruments found in physics How do errors arise? Applying limits of error of measurement Determining the degree of significance in the result of using a formula Spreading the error The meaning of a mean (or average)
Chapter summary Answers to ITQs Examination-style questions
14 17 18
20 21 22 23 24 24
Contact forces and non-contact forces Gravitational force The magnitude of a gravitational force Mechanical forces Non-contact forces Magnetic forces Elastic forces Nuclear forces
Chapter summary Answers to ITQs
76 78 79 81 82 83 83 84 84 85
3 Acquiring Experimental Skills
26
Examination-style questions
85
Introduction to experimental skills Experimental errors Carrying out practical activities
26 27
7
30
Moments and Levers Coplanar forces Equilibrium
87 87 88
Experimentation
32
Examples of possible experiments for testing practical
skills
36
Finding the position of a centre of mass The lever principle applied in machines Stability
95 97 100
Criteria for the assessment of practical skills
39
Practical activity to practice and to assess manipulation
and measurement (M/M) skills
41
Chapter summary Answers to ITQs Examination-style questions
101 102 103
Activity to assess planning and designing (P/D) skills 43
Issues involved in assessing analysis and interpretation
8 Motion in a Straight Line
104
(A/I) skills
47
Galileo and Newton
104
Chapter summary
47
The relationship between `distance?time' graphs
Answers to ITQs
48
and speed
105
Examination-style questions
48
Dynamics and Newton's laws of motion
112
Testing Newton's laws by experiment
117
Chapter summary
122
Answers to ITQs
122
Examination-style questions
123
iii
9 Energy, Work and Power Introduction The meaning of energy Types of potential energy Kinetic energy The principle (or law) of conservation of energy Frictional force and energy Power Efficiency Energy sources Chapter summary Answers to ITQs Examination-style questions
10 Pressure and Archimedes' Principle Introduction Pressure Pressure due to solids Pressure due to liquids at rest Archimedes' principle Application of Archimedes' principle to sinking and floating Chapter summary Answers to ITQs Examination-style questions
Section B: Kinetic Theory and Thermal Physics
11 The Kinetic Model of Matter Particles of matter The Kinetic Theory of matter Evidence for the Kinetic Theory Applying the Kinetic Theory Change of state Chapter summary Answers to ITQs Examination-style questions
12 Temperature and its Measurement Thermometers are everywhere What is temperature? Measurement of temperature Thermometers in practice Chapter summary Answers to ITQs Examination-style questions
13 Measuring Heat Energy The Caloric Theory of heat Experiments on the nature of heat Heat as energy transfer Specific heat capacity Specific latent heat The importance of specific heat capacity and latent heat Chapter summary Answers to ITQs Examination-style questions
iv
126 126 127 129 132 133 134 135 138 141 142 143 144
145 146 146 147 149 156
159 162 163 164
166
168 168 169 169 172 174 180 181 182
183 183 184 186 190 193 194 194
195 196 196 198 198 204
209 210 210 211
14 Methods of Heat Transfer
213
More ways than one!
213
Methods of heat transfer
214
Absorbers, reflectors and radiators of electromagnetic
(radiant) energy
218
Practical applications of heat transfer methods
220
Chapter summary
223
Answers to ITQs
224
Examination-style questions
224
15 The Behaviour of Gases
226
Putting gases to work
226
Boyle's law
227
Charles' law
231
The pressure law
232
The general gas equation
234
Chapter summary
235
Answers to ITQs
236
Examination-style questions
236
Section C: Waves and Light
239
16 What Are Waves and How Are They Produced?
240
Introduction
240
How are waves produced?
241
Transverse and longitudinal waves
243
Waves in a ripple tank
245
What happens when a wave travels through a medium? 246
Matter waves and electromagnetic waves
249
Chapter summary
250
Answers to ITQs
251
Examination-style questions
251
17 Wave Characteristics
252
Introduction
252
Frequency and period
253
Phase and wavelength
254
Displacement and amplitude
256
Wavefronts
257
Wave speed
258
Chapter summary
259
Answers to ITQs
260
Examination-style questions
261
18 Sound as Wave Motion
263
Introduction
264
Production and propagation of sound waves
264
Reflection of sound
269
Refraction of sound
270
Interference of sound waves
273
Diffraction of sound
276
Pitch and loudness of sound
279
The audible range
279
Ultrasound
279
Chapter summary
281
Answers to ITQs
281
Examination-style questions
282
19 Electromagnetic Waves
283
Introduction
284
How are electromagnetic waves produced?
284
The nature of electromagnetic waves
284
Electromagnetic spectra
286
The complete electromagnetic spectrum
286
Special properties and uses of electromagnetic waves 288
General properties of electromagnetic radiation
291
Chapter summary
292
Answers to ITQs
293
Examination-style questions
293
20 Light
295
Introduction
296
Rival theories of light ? a touch of history
296
Current theory of light: wave?particle duality
297
Use of the photon in modern technology
297
Light behaving like a wave: Young's slits
298
Light travels in straight lines
300
Eclipses of the Sun and the Moon
302
The pinhole camera
303
Chapter summary
305
Answers to ITQs
306
Examination-style questions
306
21 Reflection of Light
307
Introduction
307
The laws of reflection
308
Locating the image formed by a plane mirror
309
Features of the image formed by a plane mirror
312
Some uses of plane mirrors in physics
316
Chapter summary
316
Answers to ITQs
316
Examination-style questions
317
22 Refraction of Light and its Relation to Colour
318
Introduction
319
The laws of refraction
320
Tracing the path of light rays through rectangular blocks
and triangular prisms
321
The reversibility principle
323
The refractive index: comparing refraction in transparent
media
325
Finding the refractive index of a glass block by experiment
327
Critical angle for two transparent media in contact 329
Total internal reflection
330
The 90??45??45? prism
331
Total internal reflection in optical fibres
332
Dispersion of white light
333
Newton and colour
335
Producing a pure spectrum
326
Recombining the colours of the light spectrum
337
The colours of objects
338
Chapter summary
338
Answers to ITQs
340
Examination-style questions
340
23 Lenses
342
Lenses: what are they and how do they work?
343
The shapes of lenses
343
Lens terminology
346
How to locate (find the position of) a virtual image
354
Constructing ray diagrams
355
Construction of ray diagrams for diverging lenses
358
The differences between images produced by converging
and diverging lenses
359
Solving lens problems using a scale construction
362
The lens equation (lens formula)
365
Chapter summary
367
Answers to ITQs
368
Examination-style questions
368
Section D: Electricity and Magnetism 369
24 Electrostatics
370
Static and current electricity
371
Static electric charge
371
Electron theory of charging and conduction
373
Methods of charging and discharging
375
Detecting and estimating charge
377
Distribution of charge on the surface of a conductor 378
Electric fields
379
Storing electric charge
380
Chapter summary
381
Answers to ITQs
382
Examination-style questions
382
25 Current Electricity
384
Safety first
385
A simple invention that revolutionised the world!
385
Electric current and charge
386
Alternating and direct current
387
Energy and electric circuits
388
Describing electrical circuits
390
Setting up a d.c. electrical circuit
395
Chapter summary
396
Answers to ITQs
397
Examination-style questions
397
26 More about Electrical Circuits
399
Introduction
400
Series circuits
400
Voltage (potential difference, or p.d.) in
series circuits
401
Resistance in series circuits
401
Parallel circuits
403
Combined series and parallel circuits
406
Current?voltage relationships
407
Determining current?voltage relationships
408
Energy and power in an electric circuit
412
Chapter summary
412
Answers to ITQs
413
Examination-style questions
414
v
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