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TOPIC 1: TRANSPORTATION | BIOLOGY FORM 6 NOTES ☰ MENU Biology Form 6 1. Introduction to Transport 2. Biophysical Principles 3. Water Potential Dynamics 4. Xylem Histology 5. Phloem Histology 6. Root Transport Pathways 7. Transpiration Mechanism 8. Stomatal Opening & $K^+$ 9. Animal Circulation 10. The Mammalian Heart 11. Cardiac Cycle & ECG 12. Fetal Circulation Topic 1: Transportation FULL NOTES PDF 1. Introduction: The Biological Necessity Transportation is the physiological act of relocating materials within an organism. In the biological context, it ensures the delivery of nutrients and removal of metabolic wastes. The Constraint of Scale In small unicellular organisms, the Surface Area to Volume (SA:V) ratio is high enough for diffusion to suffice. However, as multicellular organisms grow complex, the distance between the external environment and internal cells increases. Diffusion becomes too slow. Therefore, specialized systems are required to bridge this gap. Mass Flow Systems Materials are generally moved by Mass Flow, which is the bulk transport of materials resulting from pressure differences between two points. Plants: Utilize the Vascular system (Xylem for water, Phloem for food). Animals: Utilize the Blood vascular system and Alimentary canal. 2. Biophysical Principles of Transport Understanding transportation requires mastering the physical laws that govern molecule movement. Diffusion vs. Osmosis + Diffusion: Net movement of materials from high to low concentration. Passive and energy-free. Osmosis: Movement of water molecules through a semi-permeable membrane. It is defined by water potential gradients. Active Transport + Transportation against a concentration gradient. Requires ATP and is characterized by: High Mitochondrial density. High metabolic rates. Temperature sensitivity. Significance of the Transport System 1. Nutrient distribution. 2. Excretory waste carriage. 3. Hormone transport. 4. Antibody distribution. 5. Respiratory gas exchange. 3. Water Potential Dynamics ($\Psi$) In advanced biology, we use the term Water Potential ($\Psi$) to describe water movement. The Fundamental Equation $$\Psi = \Psi_s + \Psi_p$$ $\Psi_s$ (Solute Potential): Effect of dissolved solutes. Always negative. $\Psi_p$ (Pressure Potential): Hydrostatic pressure exerted by the cell wall. Usually positive. Plasmolysis and Turgidity When a cell is in a solution of lower water potential (hypertonic), it loses water. The protoplast shrinks away from the wall—this is Plasmolysis. Incipient Plasmolysis: The point where $\Psi_p = 0$ (Cell is flaccid). Turgid: Full inflation of the protoplast against the cell wall, providing structural support. Request Math Problem Set on $\Psi$ 4. Histology of Xylem Tissue Xylem is a complex tissue specialized for the upward conduction of water and dissolved minerals (Sap). The Four Cell Types Tracheids: Elongated cells with tapering ends. Lignified and dead at maturity. Present in all vascular plants. Vessel Members: Highly specialized, shorter, and wider than tracheids. They form continuous tubes (Vessels) due to perforated end walls. Xylem Fibres: Slender, thick-walled cells providing mechanical strength. Xylem Parenchyma: The only living cells in xylem. Used for lateral transport and storage. Adaptations for Efficient Flow Dead Cells: Empty lumen reduces resistance to mass flow. Lignification: Prevents vessel collapse under the high tension of the transpiration pull. Pits: Allow lateral movement between vessels. 5. Histology of Phloem Tissue Phloem is responsible for Translocation. Cell Type Key Characteristics Sieve Tubes Living but lack nucleus, ribosomes, and vacuoles. Connected by sieve plates. Companion Cells Nucleated and highly metabolic. Provide ATP and proteins to Sieve Tubes. Phloem Parenchyma Food storage and lateral movement. Phloem Fibres Non-conducting, providing structural support. 6. Movement Across the Root Water enters via root hairs and travels to the xylem through three distinct pathways: 1. Apoplast Pathway + Movement through non-living parts (cell walls and intercellular spaces). It is fast but blocked at the endodermis by Casparian Strips. 2. Symplast Pathway + Movement through the living protoplast via Plasmodesmata (cytoplasmic strands). 3. Vacuolar Pathway + Osmotic movement from vacuole to vacuole across cell membranes and tonoplasts. The Casparian Checkpoint The Casparian strips (Suberin bands) force water into the symplast. This allows the endodermal cells to “monitor” and control the ions entering the xylem, protecting the plant from toxic substances. 7. Transpiration: The “Necessary Evil” The loss of water vapor from aerial parts of the plant. It creates the Transpiration Pull. Types of Transpiration Stomatal (90{93c24fd6cacbcd7660749606bbfee15e2f0dc7a17fc0d61a10d1e769d752be52}): Major route via leaf pores. Cuticular: Minimal loss through waxy cuticle. Lenticular: Through small slits in woody stems. Forces of the Transpiration Stream 1. Cohesion: Water molecules sticking together (Hydrogen bonds). 2. Adhesion: Water sticking to xylem walls. 3. Root Pressure: Osmotic pressure from the roots. 8. Mechanism of Stomatal Action The opening and closing of stomata is regulated by the turgidity of guard cells, explained by the **$K^+$ Ion Hypothesis**. The Process in Light: ATPase stimulation: Light activates ATP-driven proton pumps. Proton Efflux: $H^+$ ions are pumped out of guard cells. Potassium Influx: $K^+$ ions enter to maintain electrical neutrality. $\Psi$ Decrease: High $[K^+]$ lowers the water potential of guard cells. Osmosis: Water enters; guard cells become turgid and the stoma opens. 9. Transport in Animals Animals use a circulatory system driven by mass flow to move blood containing gases, nutrients, and hormones. Open vs. Closed Systems Open System: Blood baths organs directly in a Haemocoel (Insects). Low pressure. Closed System: Blood is confined to vessels (Vertebrates). High pressure and efficient. 10. The Mammalian Heart The heart is a myogenic muscular pump composed of specialized **Cardiac Muscle**. Cardiac Adaptations Myogenic: Contractile stimulus begins within the muscle (SAN). Fatigue Resistant: Numerous mitochondria and high vascularization. Long Refractory Period: Prevents tetany (cramp). 11. The Cardiac Cycle One complete heartbeat consisting of contraction (Systole) and relaxation (Diastole). Phase Action Sound Atrial Systole Atria contract; blood enters ventricles. – Ventricular Systole Ventricles contract; AV valves shut. LUB Ventricular Diastole Ventricles relax; Semi-lunar valves shut. DUB 12. Fetal Circulation: Adapting to the Uterus Since fetal lungs are non-functional, blood is oxygenated at the placenta. Special shunts bypass the lungs: Ductus Venosus: Bypasses the liver. Foramen Ovale: Hole between right and left atria. Ductus Arteriosus: Connection between pulmonary artery and aorta. Changes at Birth Inflation of lungs reduces resistance. The Foramen Ovale closes due to pressure changes. Failure to close results

GENETICS | Advanced Biology Form 6 BIOLOGY FORM 6 1. Introduction to Genetics 2. Molecular Genetics (DNA/RNA) 3. Protein Biosynthesis 4. Mendelian Genetics 5. Non-Mendelian Inheritance 6. Variation & Mutation 7. Genetic Disorders 8. Genetic Engineering Menu TOPIC 4: GENETICS A comprehensive study of heredity, variation, and the molecular mechanisms that govern life. 1. Introduction to Genetics Genetics is broadly defined as the scientific study of heredity and variation. To understand genetics is to understand the very blueprint of life itself. Heredity: This is the biological process whereby genetic factors are transmitted from one generation to the next. It explains why offspring resemble their parents. Variation: These are the morphological, physiological, and genetic differences that exist among individuals of the same species. Variation is the raw material for evolution. Key Concept: Hereditary Materials Hereditary materials are the chemical units (located on chromosomes) responsible for storing and transmitting genetic information. For a molecule to act as a hereditary material, it must satisfy specific criteria: Metabolic Stability: It must be chemically inert and stable to preserve the integrity of the code. Self-Replication: It must be able to make exact copies of itself before cell division. Mutation Potential: It must be capable of undergoing slight changes (mutations) to allow for evolution. Information Storage: It must carry the code for all the organism’s traits. Linearity: The information is arranged in a linear sequence (like letters in a sentence). The Species Concept What defines a species? In genetics, the definition is precise but can vary depending on the biological context. 1. Genetic Definition A species is a group of organisms that share a common gene pool and possess the same number of chromosomes. The gene pool represents the sum total of all genes (and their alleles) found in the breeding population. 2. Ecological Definition Ecologically, a species is defined as a group of organisms that occupy a distinct ecological niche. According to the competitive exclusion principle, no two species can occupy the exact same niche indefinitely. 3. Biological/Breeding Definition This is the most common definition: A species is a group of organisms that can freely interbreed to produce fertile offspring. Practical Example: A horse and a donkey can mate to produce a mule. However, the mule is sterile (infertile). Therefore, the horse and the donkey are confirmed to be separate species. 2. Molecular Genetics: DNA & RNA The physical basis of heredity lies in macromolecules known as Nucleic Acids. These are polymers made up of repeating units called nucleotides. Structure of a Nucleotide Every nucleotide consists of three distinct chemical components linked by condensation reactions: Pentose Sugar: A 5-carbon sugar (Ribose in RNA, Deoxyribose in DNA). Phosphate Group: Derived from phosphoric acid, this gives nucleic acids their acidic nature. Nitrogenous Base: An organic base which codes for genetic information. Purines (Double Ring) Adenine (A) Guanine (G) Pyrimidines (Single Ring) Cytosine (C) Thymine (T) – DNA only Uracil (U) – RNA only DNA vs RNA: A Comparative Analysis Feature Deoxyribonucleic Acid (DNA) Ribonucleic Acid (RNA) Strand Structure Double-stranded helix (Antiparallel) Single-stranded Sugar Deoxyribose (Lacks one oxygen at C2) Ribose Nitrogenous Bases A, G, C, Thymine (T) A, G, C, Uracil (U) Location Nucleus (Chromosomes), Mitochondria, Chloroplasts Cytoplasm, Ribosomes, Nucleolus Function Storage of genetic information Protein synthesis and transfer of genetic code Stability Highly stable Less stable, rapidly degraded DNA Replication (Semi-Conservative) DNA replication is the process by which DNA makes an exact copy of itself. It is termed semi-conservative because each new DNA molecule consists of one “old” (conserved) strand from the parent and one newly synthesized strand. Read Mechanism of Replication Mechanism Steps: Unwinding: The enzyme DNA Helicase breaks the hydrogen bonds between the base pairs, causing the double helix to unzip. Template Activation: Each separated strand acts as a template. Free nucleotides in the nucleoplasm are activated (phosphorylated). Polymerization: The enzyme DNA Polymerase attaches complementary free nucleotides to the exposed bases on the template strands. Adenine pairs with Thymine (2 H-bonds). Guanine pairs with Cytosine (3 H-bonds). Elongation: DNA Polymerase synthesizes the new strand continuously on the leading strand and discontinuously (in Okazaki fragments) on the lagging strand. Joining: The enzyme DNA Ligase seals the gaps between fragments. Significance: This precise copying ensures that daughter cells receive the identical genetic information as the parent cell during mitosis. 3. Protein Biosynthesis The “Central Dogma” of biology states: DNA → RNA → Protein. This process involves two major stages: Transcription and Translation. The Genetic Code The genetic code is the set of rules by which information encoded in genetic material is translated into proteins. It is a Triplet Code, meaning a sequence of three bases (a codon) codes for one amino acid. Degenerate: Most amino acids are coded for by more than one codon (e.g., GGU, GGC, GGA all code for Glycine). This protects against mutations. Universal: The same codons code for the same amino acids in almost all organisms (from bacteria to humans). Non-overlapping: The code is read sequentially, three bases at a time, without skipping. Punctuation: There are “Start” codons (AUG) and “Stop” codons (UAA, UAG, UGA). Stage 1: Transcription (Nucleus) Transcription is the synthesis of mRNA from a DNA template. Unwinding: A specific region of DNA (the cistron/gene) unwinds. Template Selection: Only one strand (the template/antisense strand) is used. Base Pairing: Free RNA nucleotides pair with the DNA template. Important: Adenine on DNA pairs with Uracil on RNA. Enzyme Action: RNA Polymerase links the nucleotides to form the mRNA strand. Release: The mature mRNA leaves the nucleus via nuclear pores to the cytoplasm. Stage 2: Translation (Ribosome) Translation is the conversion of the mRNA base sequence into an amino acid sequence (polypeptide). View Step-by-Step Translation Activation: Amino acids are activated by ATP and attach to their specific tRNA molecules (forming aminoacyl-tRNA). Initiation: The ribosome binds to the mRNA “Start” codon (AUG). The tRNA carrying Methionine (anticodon UAC) binds to this codon. Elongation: A second tRNA enters the ribosome carrying the next amino acid. A peptide bond forms between the first and second

Physics Form 6 Notes – Advanced Environmental & Electricity Physics Form 6 I. Environmental Physics 1.0 Introduction 1.1 Agriculture Physics 1.2 Human Survival 1.3 Renewable Energy 1.4 Built Environment 1.5 Remote Sensing 1.6 Geophysics 1.7 Pollution II. Current Electricity 2.1 Drift Velocity 2.2 Current Density 2.3 Resistance & Ohm’s Law 2.4 Temp. Coefficient Interactive & Lab Lab: Drift Velocity ACSEE Problems 1.0 Environmental Physics Definition: Environmental physics is an interdisciplinary field integrating physical processes in the Atmosphere, Biosphere, Hydrosphere, and Geosphere. It studies the response of living organisms to their environment. The environment is structured within the relationship between: Atmosphere: The gaseous envelope surrounding the Earth. Hydrosphere: All water bodies including oceans, rivers, and groundwater. Lithosphere (Geosphere): The solid Earth, rocks, and soil. Biosphere: The zone where life exists, interacting with all other spheres. 1.1 Agriculture Physics Agriculture physics applies physical principles to soil, plant, and atmospheric systems to optimize food production. A. Solar Radiation & Plant Growth Photosynthetically Active Radiation (PAR): Plants utilize light in the 400-700 nm range. The intensity of radiation determines the rate of photosynthesis. Phototropism: Growth towards light. Photoperiodism: Response to the length of day/night cycles (flowering). B. Wind, Air Temperature & Rainfall Wind: Increases transpiration rate by removing the boundary layer of saturated air from leaves. Mechanical stress from wind also strengthens stems (thigmomorphogenesis). Air Temperature: Dictates the rate of biochemical reactions (enzyme activity). Every plant has a minimum, optimum, and maximum temperature for growth ($T_{min}, T_{opt}, T_{max}$). Rainfall: Provides water for turgidity, nutrient transport, and photosynthesis electrons. C. Soil Physics Soil physics deals with the physical properties of soil that influence plant growth: Soil Texture & Structure: Determines porosity and aeration. Soil Water Potential: Governs how easily plants can extract water. Thermal Properties: Soil heat capacity controls how fast soil warms up in spring. Dark soils absorb more heat than light soils (Albedo effect). 1.2 Human Survival Physics Humans are homeotherms, maintaining a relatively constant body temperature (~37°C) despite environmental changes. Physics governs this thermal regulation. The Energy Balance Equation $$ S = M – W \pm R \pm C – E $$ \(S\) = Heat storage rate (W) \(M\) = Metabolic rate (Heat production) \(W\) = Mechanical work done by the body \(R\) = Radiation heat exchange \(C\) = Convection heat exchange \(E\) = Evaporation heat loss (Sweating) Heat Exchange Mechanisms Metabolism ($M$): The biochemical process of converting food into energy. Basal Metabolic Rate (BMR) is the energy required at rest. Radiation ($R$): Transfer of heat via electromagnetic waves. Depends on the temperature difference between skin and surroundings ($R \propto T_{skin}^4 – T_{env}^4$). Convection ($C$): Heat loss to air or water moving across the skin. Wind chill factor increases convection loss. Evaporation ($E$): The most effective cooling mechanism in hot environments. Latent heat of vaporization ($L_v$) removes heat as sweat turns to vapor. 1.3 Energy from the Environment Renewable energy physics focuses on converting natural energy flows into useful work. Photovoltaic (PV) Converts photon energy ($E=hf$) into electrical current using PN-junction semiconductors. Efficiency depends on band-gap energy and temperature. Wind Power Power extracted is proportional to the cube of wind speed: $$ P = \frac{1}{2} \rho A v^3 $$ where $\rho$ is air density and $A$ is rotor area. Geothermal Utilizes radioactive decay heat from the Earth’s core. Operates via steam turbines driven by hydrothermal reservoirs. Wave Energy Captures kinetic and potential energy of ocean waves. Wave power density depends on wave height squared ($H^2$) and period ($T$). 1.4 Built Environment & Remote Sensing The Built Environment Physics applied to human-made structures. Key concepts involve heat transfer and comfort. Thermal Comfort: Dependent on air temperature, radiant temperature, humidity, and air velocity. U-Value: Measure of thermal transmittance through walls. Lower U-values mean better insulation ($Rate = U \cdot A \cdot \Delta T$). Natural Ventilation: Using pressure differences caused by wind (Bernoulli’s principle) and stack effect (warm air rising) to cool buildings. Remote Sensing The acquisition of information about an object without making physical contact, typically via satellite or aircraft. Physics Principle: It relies on the detection of Electromagnetic Radiation (EMR) reflected or emitted from the Earth’s surface. Different surfaces (water, soil, vegetation) have distinct Spectral Signatures. Active Sensors: Emit their own energy (e.g., Radar, LiDAR). Passive Sensors: Detect natural energy (Sunlight) reflected (e.g., Photography, Landsat). 1.6 Geophysics (Seismology) Seismology is the study of earthquakes and the propagation of elastic waves through the Earth. Elastic Rebound Theory Explains earthquake generation: Tectonic forces deform rocks. When stress exceeds rock strength, rupture occurs, and rocks “rebound” to an unstrained position, releasing energy as seismic waves. Seismic Waves Classification Type Name Nature Characteristics Body P-Waves Longitudinal Fastest ($~8 km/s$). Pass through solids, liquids, gases. Body S-Waves Transverse Slower ($~4.5 km/s$). Cannot pass through liquids (Outer Core). Surface L-Waves Complex Slowest. Travel along surface. Cause most structural damage. Shadow Zones: The S-wave shadow zone (103° to 103°) provides the primary evidence that the Earth’s Outer Core is liquid, as S-waves cannot penetrate it. 1.7 Environmental Pollution Transport Mechanisms How pollutants move in the atmosphere: Advection: Horizontal transport of pollutants by wind. Diffusion: Spreading of pollutants from high to low concentration due to turbulence. Deposition: Removal of pollutants via rain (Wet deposition) or gravity (Dry deposition). Optical Properties & Visibility Pollution affects how light travels through the atmosphere, reducing visibility. Scattering: Particulates (aerosols) scatter light. Mie Scattering occurs when particles are similar in size to the wavelength of light (causing white smog). Rayleigh Scattering affects smaller molecules (blue sky). Absorption: Some pollutants (like soot or $NO_2$) absorb light, causing dark smoke or brownish haze. Nuclear Waste Radioactive waste management involves shielding and isolation. High-Level Waste (HLW): Spent fuel. Requires cooling and deep geological disposal. Half-life ($T_{1/2}$): The time taken for radioactivity to drop to half. Waste must be stored for multiple half-lives. 2.0 Current Electricity 2.1 Drift Velocity Theory In a conductor, free electrons move randomly. When an electric field $E$ is applied, they acquire a slow average velocity component called Drift Velocity ($v_d$). Derivation of \(I =

Form Six Advanced Physics — Complete Text Notes with Examples Form 6Physics Complete text notes · equations · questions · no scanned pages ⌕ 01 Measurement & Dimensions 02 Gravitation 03 Viscosity & Fluid Dynamics 04 Thermodynamics 05 Heat Transfer 06 Stationary Waves & Resonance 07 The Doppler Effect 08 Wave Optics: Interference 09 Polarization of Light 10 Electrostatics 11 Capacitors 12 Surface Tension & Capillarity Download Full PDF Compiled from Mechanics, Thermal, Waves, Optics & Electricity notes. Tap any + example panel to expand a worked solution. Interactive Study Reference Form Six Advanced Physics — Complete Text Notes All concepts from the uploaded 65-page source document are arranged into readable chapters. The page is text-only: scanned images are removed, formulas are written in equation boxes, and the full source transcript is preserved page-by-page below each chapter for completeness. Extra worked examples have been added to make revision easier. Download Full PDFOpens WhatsApp request message. Coverage and completeness 65 pages This version contains two layers: a cleaned study layer for understanding, and a complete page-by-page text transcript layer for every readable page from the uploaded source. No scanned page images are embedded. Mechanics: measurement, dimensions, derivation, gravitation, viscosity and fluid flow. Thermal physics: thermodynamics, heat capacities, ideal gases, heat transfer and radiation. Waves and optics: resonance, Doppler effect, interference, polarization. Electricity and fluids: electric flux, fields, potential, capacitors, surface tension and capillarity. Quick equation reference Area Key equations Use Dimensions \([A]=L^2\), \([V]=L^3\), \([v]=LT^{-1}\) Checking formula correctness and deriving relationships. Gravitation \(F=GM_1M_2/r^2\), \(g’=g(1-d/R)\), \(g’=gR^2/(R+h)^2\) Weight change with distance, depth and altitude. Fluids \(Q=V/t=Av\), \(P_2=\frac{P_1r_1^4l_2+P_3r_2^4l_1}{r_1^4l_2+r_2^4l_1}\) Flow rate and pressure at tube junctions. Thermal \(\Delta Q=\Delta U+W\), \(PV=nRT\), \(PV^\gamma=constant\), \(Q/t=kA\Delta T/L\) Gas processes, work, internal energy and conduction. Waves/Optics \(T=2\pi\sqrt{l/g}\), \(f_0=\frac{V}{V-U_s}f\), \( heta=\lambda/a\) Pendulum, Doppler effect and interference fringes. Electricity/Capillarity \(\Phi=Q/\varepsilon_0\), \(C_p=C_1+C_2+…\), \(1/C_s=1/C_1+…\), \(h=2\gamma/( ho gr)\) Flux, capacitor combinations and capillary rise. Formula writing — Important equations are boxed and rendered using MathJax style. Question practice — Problem banks are grouped in expandable panels for revision. No scanned pages — Only written text is included; images from the PDF are not embedded. Complete concepts — OCR source text is preserved below each chapter as text-only source pages. 01 Measurement & Dimensional Analysis Mechanics Measurement is the process of assigning numbers to a given physical quantity. To describe the behaviour of objects we must consider matter, space and time — every measurable property in mechanics reduces to combinations of these. Physical quantities Fundamental (basic) quantities — independent physical quantities such as mass, length and time. Each has both a dimension and a standard unit. Dimensions are represented as M, L and T respectively. Derived quantities — obtained by combining fundamental quantities, e.g. area, volume, density, speed and momentum. Common derived dimensions \[ [A] = L\times L = L^2 \qquad [V] = L\times L\times L = L^3 \] \[ [\rho] = \frac{M}{V} = ML^{-3} \qquad [v] = \frac{\text{Distance}}{\text{Time}} = LT^{-1} \] Dimension & dimensional analysis Dimension is the way in which a physical quantity is related to the fundamental physical quantities. Dimensional analysis shows how physical quantities relate to each other. A quantity whose dimension involves more than one fundamental unit is written generally as \(K(M)^x(L)^y(T)^z\), where \(K\) is a pure number and \(x,y,z\) are the powers (“dimensions”) of the derived unit. Example — the area of a square of side 1 m: \((L)\times(L)=L^2\); so area has the dimension of length squared. Velocity is the rate of change of displacement, \(V = L/T = LT^{-1}\). Uses of dimensions: deriving formulae, and checking the homogeneity of an equation (both sides must carry the same dimensions). Worked derivation — relating Work, mass and velocity solved Suppose observation suggests work \(W\) is proportional to mass \(m\) and velocity \(v\): \[ W = k\,m^x v^y \qquad (i) \] Since \(W = F\times s\) and \(F=ma\): \[ [W] = [F][s] = MLT^{-2}\cdot L = ML^2T^{-2} \] \[ [v] = LT^{-1} \] Substituting the dimensions into (i): \[ M^1L^2T^{-2} = k\,M^xL^yT^{-z} \] Equating indices: for M, \(x=1\); for L, \(y=2\); for T, \(-y=-2 \Rightarrow y=2\). Result: \( W = k\,m\,v^2 \) (with \(k=\tfrac12\) from full mechanics, giving the familiar kinetic-energy form). Additional worked example for revision Extra example — test dimensional correctness Check whether \(s=ut+\frac12at^2\) is dimensionally correct. Solution \[ [s]=L \] \[ [ut]=(LT^{-1})(T)=L \] \[ [at^2]=(LT^{-2})(T^2)=L \] Every term has dimension \(L\), so the equation is dimensionally homogeneous. No scanned page is embedded here. The full source content is preserved as searchable text below, while the study notes above are rewritten for easier understanding. Complete text-only source transcript for this chapter (pages 1-4) This is the complete readable source text for the pages assigned to this chapter. It is included to preserve all concepts and original questions while keeping the page text-only. Some characters may reflect OCR limitations from the scanned PDF, but formulas and concepts are also rewritten clearly above. Source page 1 MECHANICS 1.0 MEASUREMENT Measurement is the process of assigning numbers to a given physical quantity. 1.0 Physical Quantity In describing the behavior of objects around us we have to consider to matter, space and time. A moving body covers distance with time and for an object to move energy is required. For the motion to take place, force must be applied. When an object is in the course of motion changes its speed within a given time interval we said that it is undergoing acceleration. In all this we have physical quantities which are measurable and whose values can be used in the mathematical expressions to give numerical description about the object in a question. The physical quantities are divided into two categories which are fundamental / basic quantitics and derived quantities. (a) Fundamental quantities These are independent physical quantities such as mass, length and time. These quantities have both dimensions and standard units which can be expressed dimensionally.The dimensions of mass, length and time are represented as M, L and T respectively. The term dimension is used to denote the nature of physical quantity.