Physics: Physical vs Non-Physical Quantities

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Questions and Answers

Which of the following is an example of a physical quantity?

  • Emotions
  • Feelings
  • Mass (correct)
  • Happiness

What is required to express measurements?

  • Comparison with non-physical quantities
  • A reference to feelings
  • A description of emotional states
  • A unit and the magnitude of the quantity (correct)

What does 'P.Q = mag. × unit' represent?

  • The formula for expressing physical quantities (correct)
  • The relationship between physical and non-physical quantities
  • The equation for converting units
  • The definition of measurement

Which of the following best describes a non-physical quantity?

<p>A quantity that cannot be quantified or measured (D)</p> Signup and view all the answers

What is the basic reference standard for measuring time?

<p>1 second (C)</p> Signup and view all the answers

Flashcards

What is Mass?

The measure of an object's resistance to acceleration when a force is applied.

What is required to express measurements?

Measurements require both a unit (e.g., meter, second) and the magnitude (numerical value) of the quantity.

What does 'P.Q = mag. × unit' represent?

The formula 'P.Q = mag. × unit' represents how physical quantities are expressed, as the magnitude multiplied by the unit.

What is a non-physical quantity?

A non-physical quantity is one that cannot be quantified or measured using scientific instruments or methods.

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What is the base unit of time?

One second, standardized and used as the fundamental reference for measuring duration.

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Study Notes

Physical and Non-Physical Quantities

  • Physical quantities can be measured using instruments. Examples include:
    • Mass
    • Length
    • Time
    • Current
  • Non-physical quantities cannot be measured. Examples include:
    • Feelings
    • Emotions

Measuring Physical Quantities

  • Measurement compares a physical quantity to a basic reference standard, called a unit.
  • Common units include 1 meter (m), 1 kilogram (Kg), and 1 second (s).
  • Expressing a measurement requires both:
    • Unit
    • Magnitude (value) of the quantity - how many times the unit is contained in the quantity
  • Physical Quantity (P.Q) = Magnitude (m) × Unit (u)

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