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Dimensions of Weight

Dimensions of Weight

The amount of force of gravity exerted on an object is called Weight. Weight is generally calculated in Newtons. If no gravity acts on the body, the weight becomes zero, like in space. It implies that the weight of a particular object can vary based on the location. The dimensions of weight aid in deriving the equations or formulas and measuring an object's weight at distinct locations.

Weight

Image: Weight

Table of Contents:

The Formula of Weight

The formula used to find the weight can be expressed as

formula

Where w represents the weight,

m determines the Mass, and

g denotes gravity.

Dimensional Formula of Weight

The formula for the dimensions of weight can be written as

formula

Where M denotes the Mass,

L illustrates the Length, and

T is the Time.

Derivation of Weight

We need to follow the steps below to derive the formula for the dimensions of weight.

formula

Or

formula

Therefore, the derived formula for the dimensions of weight can be written as formula

Restrictions of Using Dimensional Formula

There are certain restrictions to utilising the dimensional formula. They include the following:

  • It does not provide the accurate numeric values of the physical quantities.
  • Strictly works for only homogenous formulas or equations.
  • It does not define if the physical quantity is scalar or vector.
  • It does not function for dimensionless constants and ratios.
  • It is limited to linear equations and does not function for non-linear formulas or equations.
  • It cannot determine the behaviour of the variables of physical quantities all by itself.
  • It cannot provide the details or intricacies of the physical phenomena.

Practice Problems

Q1. The SI unit of weight is

a. Kilogram
b. Newton
c. Metres
d. Kilograms per metre

Ans. b. Newton

Q2. The symbol of weight is

formula

d. w

Ans. d. W

Q3. Choose the correct formula determining the dimensions of weight.
formula

Q4. The gravity of the Earth is

a. 9.807 ms-2
b. 9.9 ms-2
c. 7.89 ms-2
d. 6.98 ms-2

Q5. The weight formula is

formula

 

Weight can be measured by the formula formula, where m is the Mass and g represents the gravity.

Frequently Asked Questions

Q1. State three differences between mass and weight.

  1. The differences are as follows.
  1. Mass cannot be zero, but weight can be zero due to no gravity.
  2. Mass does not fluctuate with location changes, but the weight does vary.
  3. Mass is a scalar quantity having magnitude. On the other hand, weight is the vector quantity possessing both magnitude and direction.

Q2. State some applications of dimensional formulas.

  1. There are various applications of dimensional formulas. They include the following:
  1. New formulas or equations can be derived using dimensional formulas.
  2. Equation’s correctness and consistency can be examined using dimensional formulas.
  3. Aids in determining the relationships between two or more variables involved.
  4. Helps in converting units of physical quantities of one system to another.
  5. Aid in performing approximate measurements and estimations of the values of physical quantities.

Q3. How do you measure weight?

  1. A scale or a balance is often used to determine weight. There are various sorts of scales accessible, and the specific method of measurement can differ based on the scale. A few common methods of measuring weight include mechanical scales, digital scales, spring scales, balance scales, etc.

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