Foundation Physics - Measurement of Quantities

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Questions and Answers

What is a measurement?

  • A complex formula without any quantification.
  • Only a number without any units.
  • A random estimate of a property.
  • A number coupled with a unit that defines a property. (correct)

What distinguishes direct measurement from indirect measurement?

  • Direct measurements rely on formulas to calculate values.
  • Direct measurements use only numerical values.
  • Direct measurements are always more accurate.
  • Direct measurements are obtained directly from an instrument scale. (correct)

Which of the following is NOT a type of physical quantity?

  • Mass
  • Length
  • Temperature
  • Brightness (correct)

What is required to report the result of a measurement effectively?

<p>A standard unit along with the number. (C)</p> Signup and view all the answers

How is an indirect measurement typically calculated?

<p>Through a known relationship with other directly measured quantities. (A)</p> Signup and view all the answers

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Flashcards

What is a measurement?

The combination of a number and a unit that quantifies an object's property. For example, "300 meters" measures the length of something.

Direct measurement

A measurement where the value of the physical quantity is directly read from an instrument's scale.

Indirect measurement

A measurement where the value is calculated using a formula and values obtained from direct measurements.

What is a physical quantity?

A property of an object that can be quantified or measured. Examples include length, mass, time, and temperature.

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Mass

Quantifies the amount of matter in an object. It is often measured in kilograms (kg).

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Study Notes

Foundation Physics - Measurement of Physical Quantities

  • Measurement Defined: Scientists use established logical rules to communicate information quantitatively. Measurements must be expressed in multiples of standard units.

  • Measurement Example: Reporting the distance between two cities, one's weight, or the length of a lecture requires specifying the result in terms of a standard unit (e.g., 300 meters).

  • Measurement Components: A measurement is the combination of a number and a unit that quantifies an object's property.

Types of Measurements

  • Direct Measurement: Determining a physical quantity's value directly from an instrument's scale. For example, using a ruler to measure length.

  • Indirect Measurement: Calculating a physical quantity using a known relationship (formula) between that quantity and other directly measured quantities. For example, calculating circumference from a diameter (using Ï€).

Physical Quantities

  • Physical Quantity Defined: A physical quantity represents an object's property measurable in terms of size, magnitude, or amount.

  • Types of Physical Quantities:

    • Length
    • Mass
    • Time
    • Temperature
    • Amount of Substance
    • Luminous Intensity
    • Current

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PHY 1200 Foundation Physics PDF

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