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Grade - 8 (BLE) Physics Force, Measurement

Differentiate between mass and the weight of an object.

Write the difference between mass and weight.

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The differences between mass and the weight of objects are

SN Mass Weight
1. Mass is the quantity of the matter contained in a body. Weight is the force, by which any heavenly body pulls the body of a certain mass towards its center.
2. Mass is a scalar quantity meaning it has no direction but only magnitude (value) Weight on the other hand is a vector quantity. Weight has both direction (towards the object's center) and magnitude.
3. Its SI unit is a kilogram (kg). Its SI unit is Newton (N)
4. It is a fundamental physical quantity. It is a derived physical quantity.
5. It is measured by using a pan balance or beam balance. The weight of an object is measured by using spring balance or calculated using the formula w = mg
6. Its value is constant. Its value depends on the object's mass as well as the masses of other objects influencing it.
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Things to Remember From Measurement

  • Fundamental Quantities are those physical quantities that do not depend on other physical quantities and have their own identity.
  • Those physical quantities which depend upon other physical quantities and do not have their own identity are known as derived physical quantities.
  • The standard reference quantity on the basis of which other physical quantities of the same kinds are measured is known as a unit.
  • Those units of measurement which do not depend upon any other units are called fundamental units. These are also called independent units or basic units.
  • Those units of measurement which are expressed in terms of fundamental units are called derived units. They are also known as dependent units.
  • Mass is the total amount of matter contained in a body.
  • One Kg is defined as the mass of platinum-iridium rod kept at the International Bureau of Weights and Measures in Pairs of France.
  • The amount of force exerted on an object, which pulls the object toward the center of the planet is called the weight of that object.
  • Time is the duration of the gap between any two events.
  • The pendulum clock is the device used to measure time which works by the to and fro oscillation.
  • The quartz clock is based on the principle of the quartz crystal.

Topics from Physics

Physical Quantities 27 Electricity & Magnetism 48 Motion 8 Measurement 4 Electricity 166 Physical Optics 80 Waves 117 Force 51 Heat 137 Laws of Motion 1 Light 100 Pressure 139 Thermodynamics 1

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