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Questions and Answers
What is defined as a property of matter that can be measured?
What is defined as a property of matter that can be measured?
Which of the following represents a derived unit?
Which of the following represents a derived unit?
How should units be written when expressing quantities?
How should units be written when expressing quantities?
Which physical quantity measures the rate of change in position?
Which physical quantity measures the rate of change in position?
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What is the correct SI unit for measuring electric current?
What is the correct SI unit for measuring electric current?
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What name is given to units defined as a product or quotient of base units?
What name is given to units defined as a product or quotient of base units?
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Which of these quantities is not considered a basic quantity in physics?
Which of these quantities is not considered a basic quantity in physics?
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Which of the following best describes a standard amount when measuring quantities?
Which of the following best describes a standard amount when measuring quantities?
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Study Notes
Real World Physics - Chapter 1 Introduction
- Real World Physics, Chapter 1, introduces fundamental concepts of physics.
- A physical quantity is any measurable property of matter.
What is a Physical Quantity?
- A physical quantity is a measurable property of matter.
- Examples include time, length, distance, displacement, speed, velocity, acceleration, mass, momentum, force, energy, work, power, temperature, frequency, electric current, potential difference, resistance, magnetic flux, magnetic flux density, sound intensity, electric charge, electric field strength, capacitance, and activity of a radioactive source.
Some Examples of Quantities
- A list of physical quantities and their examples is presented: Time, Moment of a Force, Electric Current, Length, Work, Distance, Energy, Displacement, Speed, Temperature, Potential Difference, Resistance, Magnetic Flux, Magnetic Flux Density, Velocity, Frequency, Activity of a Radioactive Source, Acceleration, Sound Intensity, Mass, Electric Charge, Momentum, Electric Field Strength, Capacitance.
What is Measuring?
- Measuring involves comparing a quantity to a standard amount called a unit.
SI Units
- In 1960, scientists agreed to use the International System of Units (SI).
- All units in this system are called SI units.
- SI units will be used throughout the physics course.
The Five Basic Quantities and Basic Units
- Five fundamental quantities and their corresponding base SI units are presented:
- Length (metre, m)
- Time (second, s)
- Mass (kilogram, kg)
- Electric current (ampere, A)
- Temperature (kelvin, K)
Derived Units
- Derived units are units of other quantities that can be expressed as a product or quotient of base units.
- Examples of derived units include:
- Area (square metre, m²)
- Volume (cubic metre, m³)
- Speed (metre per second, m/s or m s⁻¹)
- Density (kilogram per cubic metre, kg/m³ or kg m⁻³)
Named Units
- Some units are named after scientists who made significant discoveries in the relevant fields.
- The symbols of these units are capitalized, but the names are not.
- Examples include:
- Force: newton (N)
- Pressure: pascal (Pa)
- Work, Energy: joule (J)
- Power: watt (W)
- Frequency: hertz (Hz)
- Magnetic flux density: tesla (T)
- Magnetic flux: weber (Wb)
- Activity of a radioactive source: becquerel (Bq)
Using SI Units
- Numerical problems require using correct SI units throughout the calculations, or points will be lost in exams.
- Always include the unit with the numerical answer.
- Leave a space between the numerical value and the unit.
- Appropriate spacing between units in a derived unit should be used.
Conversion
- 1 m³ = 1,000,000 cm³ (one cubic metre is equal to one million cubic centimetres)
- 1 cm³ = 1 × 10⁻⁶ m³ (one cubic centimetre is equal to one millionth of a cubic metre)
SI Prefixes
- Common prefixes used for multiples or submultiples of SI units are presented in a table.
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Description
This quiz covers fundamental concepts from Chapter 1 of Real World Physics. It introduces the notion of physical quantities and provides examples of various measurable properties of matter, including time, mass, and energy. Test your understanding of these essential physics concepts.
