Podcast
Questions and Answers
What is the SI base unit for force, expressed in terms of the base units?
What is the SI base unit for force, expressed in terms of the base units?
- kg m s
- kg m2 s–2
- kg m s–2 (correct)
- kg s–2
Which of the following correctly expresses the Joule in terms of SI base units?
Which of the following correctly expresses the Joule in terms of SI base units?
- kg m2 s–1
- kg m s–1
- kg m2 s–2 (correct)
- kg m s–3
The unit Pascal is defined in terms of which basic quantities?
The unit Pascal is defined in terms of which basic quantities?
- kg/s m2
- N/m2 (correct)
- kg m2/s2
- N/m
How can you determine if a physical equation is homogeneous?
How can you determine if a physical equation is homogeneous?
If a derived unit is expressed as kg m–1 s–2, what is the physical quantity represented?
If a derived unit is expressed as kg m–1 s–2, what is the physical quantity represented?
Which of the following derived units is correctly matched with its definition?
Which of the following derived units is correctly matched with its definition?
Which expression represents the Joule when breaking it down into SI base units?
Which expression represents the Joule when breaking it down into SI base units?
What must all physical quantities include to be properly defined?
What must all physical quantities include to be properly defined?
Which of the following units is incorrectly matched with its corresponding physical quantity?
Which of the following units is incorrectly matched with its corresponding physical quantity?
How would a physical quantity represented by the letter 'v' indicate velocity?
How would a physical quantity represented by the letter 'v' indicate velocity?
Which of the following describes the relationship between physical quantities and their respective units?
Which of the following describes the relationship between physical quantities and their respective units?
Which statement about estimating physical quantities is true?
Which statement about estimating physical quantities is true?
What is the standard mass of an adult used in calculations?
What is the standard mass of an adult used in calculations?
Which of the following is NOT one of the SI Base Units required for this course?
Which of the following is NOT one of the SI Base Units required for this course?
What is the gravitational field strength used for calculations?
What is the gravitational field strength used for calculations?
Which derived unit would be appropriate for measuring force?
Which derived unit would be appropriate for measuring force?
What is the typical mass of a car used in estimates?
What is the typical mass of a car used in estimates?
Which base unit corresponds to the quantity of length in the SI system?
Which base unit corresponds to the quantity of length in the SI system?
Which wavelength range corresponds to visible light?
Which wavelength range corresponds to visible light?
What is the primary benefit of using SI base units?
What is the primary benefit of using SI base units?
What does the base unit 'second' measure in the SI system?
What does the base unit 'second' measure in the SI system?
Which of the following represents a derived unit in physics?
Which of the following represents a derived unit in physics?
Flashcards
Physical Quantity
Physical Quantity
A measurable property of an object or system, described by both a numerical value and a unit.
Units
Units
A standard used for measuring a physical quantity.
Numerical Magnitude
Numerical Magnitude
The number representing the size or amount of a physical quantity.
Estimating Physical Quantities
Estimating Physical Quantities
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Examples of Physical Quantities
Examples of Physical Quantities
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Derived Units
Derived Units
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SI Base Units
SI Base Units
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Homogeneity of Physical Equations
Homogeneity of Physical Equations
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Newton (N)
Newton (N)
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Joule (J)
Joule (J)
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Pascal (Pa)
Pascal (Pa)
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Checking Homogeneity
Checking Homogeneity
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Estimated Mass of Adult
Estimated Mass of Adult
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Estimated Gravitational Field Strength
Estimated Gravitational Field Strength
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Estimated Car Mass
Estimated Car Mass
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Visible Light Wavelength Range
Visible Light Wavelength Range
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Base Quantities
Base Quantities
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Number of SI Base Quantities
Number of SI Base Quantities
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Units in Physics
Units in Physics
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Units in this course
Units in this course
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Study Notes
CIE A Level Physics 1.1 Physical Quantities & Units
- Physical quantities are measured using a numerical magnitude and a unit.
- Examples include speed, velocity, and volume.
- Speed and velocity are physical quantities; speed is the rate of travel along a path, velocity is the rate of change of position in a specific direction
- Physical quantities are represented by letters of the alphabet
- Units give context to what the letters refer to - if a letter is used to represent velocity, the unit would be meters per second (m/s).
- All physical quantities must contain a numerical value and unit.
1.1.2 SI Units
- SI units are the internationally recognized system of measurement.
- There are seven base units: kilogram (kg), meter (m), second (s), ampere (A), kelvin (K), mole (mol), and candela.
1.1.3 Homogeneity of Physical Equations & Powers of Ten
- Physical equations must be homogeneous, meaning the units on both sides of the equation must be the same
- To check for homogeneity, the units of each term in an equation are substituted for the variables and are calculated,
- If the units on either side are not the same, the equation needs correction
- Powers of ten are used to represent very large or very small numbers.
- Prefixes like kilo (10³), mega (10⁶), giga (10⁹), tera (10¹²) and micro (10⁻⁶), nano (10⁻⁹)and pico(10⁻¹²) are used to represent these powers of ten.
1.1.4 Scalars & Vectors
- Scalars have only magnitude (size). Examples include distance, speed, mass, time, energy, volume, density, pressure, and temperature.
- Vectors have both magnitude and direction. Examples include displacement, velocity, acceleration, force, momentum.
- Vectors can be combined using triangle or parallelogram methods.
- To combine vectors using the triangle method: link the vectors head-to-tail. The resultant vector connects the tail of the first vector to the head of the last.
- To combine vectors using the parallelogram method: link the vectors tail-to-tail. The resultant vector is the diagonal of the parallelogram.
- Vector subtraction involves reversing the direction of one vector and following the same procedure as vector addition using the triangle or parallelogram method.
- In equilibrium, coplanar forces form closed vector triangles, implying the sum of the forces is zero.
- Vectors can be resolved into components to simplify calculations involving multiple forces or directions. The horizontal component of a given vector is Fx = F cosθ. The vertical component is Fy = F sinθ.
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Description
Explore the fundamental concepts of physical quantities and units as per the CIE A Level Physics curriculum. This quiz covers topics such as SI units, the importance of units in equations, and the distinction between speed and velocity. Test your understanding of these essential physics concepts.
