A Level Physics CCEA
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36 topics in 4 modules
āļø Forces, Energy and Electricity 12 topics
- Physical Quantities
- Scalars and Vectors
- Principle of Moments
- Linear Motion
- Dynamics
- Newton's Laws of Motion
- Linear Momentum and Impulse
- Work Done, Potential Energy and Kinetic Energy
- Electric Current, Charge, Potential Difference and Electromotive Force
- Resistance and Resistivity
- Internal Resistance and Electromotive Force
- Potential Divider Circuits
āļø Waves, Photons and Astronomy 7 topics
- Waves
- Refraction
- Lenses
- Superposition, Interference and Diffraction
- Quantum Physics
- Wave-Particle Duality
- Astronomy
āļø Deformation of Solids, Thermal Physics, Circular Motion, Oscillations and Atomic and Nuclear Physics 9 topics
- Deformation of Solids
- Thermal Physics
- Uniform Circular Motion
- Simple Harmonic Motion
- The Nucleus
- Nuclear Decay
- Nuclear Energy
- Nuclear Fission
- Nuclear Fusion
āļø Fields, Capacitors and Particle Physics 8 topics
- Force Fields
- Gravitational Fields
- Electric Fields
- Capacitors
- Magnetic Fields
- Deflection of Charged Particles in Electric and Magnetic Fields
- Particle Accelerators
- Fundamental Particles
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A Level Physics CCEA Revision Content
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A Level Physics CCEA - Forces, Energy and Electricity - Physical Quantities Content Preview
Forces, Energy and Electricity
Physical Quantities
Physical Quantities
Basic Definitions
- Physical quantities are measurable properties or qualities of a physical system.
- Physical quantities are described by a numerical magnitude and a unit. They are broadly classified into two types: Scalar and Vector quantities.
- Scalar quantities only have magnitude, for example time, speed and mass.
- Vector quantities have both magnitude and direction, such as force, velocity, and displacement.
Scalar Quantities
- Scalar quantities are completely specified by their magnitude alone.
- Magnitudes are always positive and can be added, subtracted, multiplied, or divided like ordinary numbers.
- Speed, energy, and power are some examples of scalar quantities.
Vector Quantities
- Vector quantities are described by both magnitude and direction.
- The vector sum or resultant of multiple vectors is found using the rules of vector addition.
- Examples of vector quantities include force, velocity, acceleration, and momentum.
Units of Measurement
- Units are standard quantities used to specify the magnitude of a physical quantity.
- The International System of Units (SI) is a globally agreed system of measurements that includes seven base units: metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol) and candela (cd).
- Derived units are combinations of base units, for example, force is measured in newtons (N), which are equivalent to kg m/sĀ².
Dimensional Analysis
- Dimensional analysis checks the validity of an equation by comparing the dimensions on both sides.
- It helps in converting units from one system to another and in deriving relationships between different physical quantities.
Uncertainty and Significant Figures
- Measurements always have some uncertainty, which is expressed in terms of error.
- The reported value of a measurement should only include digits that are known with certainty, plus the first uncertain digit. These digits are known as significant figures.
- When multiplying or dividing measurements, the final result should retain the smallest number of significant figures used in the calculation.
Question: What is the difference between scalar and vector quantities and provide one example for each?
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