Mechanics: Units and Measurement

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Questions and Answers

Which of the following represents a fundamental unit of measurement?

Metre (correct)
Gram
Joule
Newton

What defines a derived unit?

A unit that cannot be expressed in terms of fundamental units
A unit that has no physical representation
A unit based entirely on empirical observations
A unit derived from one or more fundamental units (correct)

Which of the following is NOT one of the seven fundamental units?

Ampere
Mole
Luminous intensity
Watt (correct)

How many fundamental units are established within the metric system?

<p>7 (B)</p> Signup and view all the answers

Which physical quantity is associated with the unit 'candela'?

<p>Luminous intensity (B)</p> Signup and view all the answers

Flashcards

Fundamental Units

Units of measurement that other units are based on.

Seven Fundamental Units

Length (metre), mass (kilogram), time (second), electric current (ampere), thermodynamic temperature (kelvin), amount of substance (mole), luminous intensity (candela).

Derived Units

Units created from fundamental units.

Study Notes

Mechanics: Units and Measurement

Fundamental Units: A unit of measurement used as a basis for other units. These include:
- Length (metre)
- Mass (kilogram)
- Time (second)
- Electric current (ampere)
- Thermodynamic temperature (kelvin)
- Amount of substance (mole)
- Luminous intensity (candela)

Derived Units

Definition: Units created from combinations of fundamental units.
Examples:
- Area (square meter)
- Volume (cubic meter)
- Density (kilogram per cubic meter)
- Speed (meters per second)
- Acceleration (meters per second squared)
- Pressure (pascal)
- Force (newton)
- Energy (joule)
- Frequency (hertz)
- Power (watt)
- Voltage (volt)
- Charge (coulomb)

Dimensional Formulas

Used to express physical quantities in terms of fundamental units (mass, length, and time).
Examples include formulas for speed, acceleration, force and work