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chapter 1 Physical quantities and Measurement class 7th physics @jatinacademy

Jatin Academy・29 minutes read

The text discusses the fundamental concepts of physics, including physical quantities, measurements, volumes of regular and irregular shapes, and speed calculations using specific formulas and units like meters per second and kilometers per hour. It also covers the use of instruments like graduated cylinders and methods like water displacement to measure liquid volumes and densities of materials by dividing mass by volume, providing a comprehensive overview of basic physics principles.

Insights

  • Physical quantities like length, distance, time, temperature, area, and volume are measurable attributes that are defined and measured using instruments with units like square meter and centimeters.
  • Calculations of volume, speed, and density in physics involve specific formulas and units such as millimeter cube, liters, meters per second, and kilograms per hour, with methods like water displacement and equations used for accurate measurements and calculations.

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Recent questions

  • What are physical quantities?

    Attributes like length, time, temperature, and volume.

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Summary

00:00

Physics Basics: Measurements, Shapes, and Units

  • The class at Things Academy begins with the first chapter of Physics, focusing on Details, Measurements, and Winners.
  • Topics covered include Water Physical Qualities, Measurement of India, and Area of Regular and Irregular Shapes.
  • Physical quantities are defined as measurable attributes like length, distance, time, temperature, area, and volume.
  • Instruments are used to measure physical quantities, with units like square meter and centimeters widely employed.
  • The relationship between multiple units of area is explained, such as kilometer square being equal to 10 square meters.
  • The area of regular shapes like rectangles and triangles is calculated using appropriate formulas.
  • The volume of regular solids, including cubes and cylinders, is determined using specific formulas.
  • Units of volume, like millimeter cube and liter, are used to measure liquid volumes like milk, oil, and petrol.
  • The International System of Units is employed to measure physical quantities, with conversions between centimeters, milliliters, and kilometers.
  • The volume of irregular shapes is calculated using methods like finding the capacity of containers and applying specific formulas for solids.

25:22

Measuring Volume in Physics Labs

  • Solving an equation results in a volume of 1536 meter cube, used in physics measurements.
  • Small syllable Jane Quinn uses sindhu measuring for kerosene and lubricating oil volume.
  • Graduation is generally used for measuring liquid volume in physics labs.
  • Relation between volume and capacity: 1 cm cube = 1 ml, 1 cm cube = 1 liter, 1 m cube = 2000 liter.
  • Graduated cylinder is used to measure liquid volume, with water displacement method.
  • To measure soap volume, calculate the difference between final and initial liquid volumes.
  • Volume of irregular solids is determined by water displacement method.
  • Volume of copper cylinders is calculated by measuring water displacement.
  • Density of materials is calculated by dividing mass by volume.
  • Speed is calculated by dividing distance covered by time taken, measured in meters per second.

54:37

Calculating Speed and Average Speed Explained

  • Speed can be calculated using the formula speed = distance/time, which can be easily computed using a speedometer or calculator. The unit of speed is discussed, with C representing centimeter, G for gram, and S for second in the CGS unit system.
  • To find average speed, total distance covered is divided by total time taken, with the unit of speed typically measured in kilometers per hour (km/hr) or meters per second (m/s). The total distance covered is the sum of all individual distances traveled.
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