1 / 5

Understanding Physical Quantities and SI Units in Mechanics

A physical quantity is a measurable attribute such as length, mass, temperature, time, or energy, each represented by a numerical size and unit. It is crucial to express all units in calculations for clarity and accuracy—e.g., 15 m + 12 m = 27 m, not 15 + 12 = 27 m. Scientists use SI units globally for consistent measurements. Additionally, derived quantities like volume and density are calculated from base units: volume = length³ (m³) and density = mass/volume (kg/m³). This standardization aids in scientific communication.

lisandra-graham
Download Presentation

Understanding Physical Quantities and SI Units in Mechanics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A physical quantity is a quantity that can be measured. • Examples of physical quantities are • Length • Mass • Temperature • Time and • Energy  . • Every physical quantity has a numerical size and a unit. All units must be written, even in intermediate working. • Example: 15 m + 12 m = 27 m. •                (Not: 15 + 12 = 27 m) Mechanics Measurement

  2. SI Units Scientists around the world agree to use the SI units for measuring physical quantities. The SI units for all other physical quantities can be expressed in terms of these base quantities. Mechanics Measurement

  3. Examples: Volume of a cube = length x length x length Hence, SI unit of volume = SI unit of length x SI unit of length x SI unit of length                                          = m x m x m                                         = m3. Density = Mass / Volume Hence, SI unit of density = SI unit for mass / SI unit for volume                                         = kg m3 Mechanics Measurement

  4. Mechanics Measurement

  5. Mechanics Measurement

More Related