Question

What are physical quantities?

Types of physical quantities? Define them

Write the seven fundamental physical quantities

Derive the dimensional formula of force.

Class:11

Topic:Units and measurements

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Answer 1

Explanation:

The quantities which used to measure the physical phenomenon known as physical quantities.

There are two types of quantities

1. fundamental
2. derived

There are 7 fundamental quantities

1. mass
2. length
3. time
4. temperature
5. electric current
6. intensity
7. amount of substance

Dimensions of force

force=mass × acceleration

=[M] × [LT^-2]

=[MLT^-2]

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Answer 2

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Explanation:

We should also know that what is unit?

Unit is parameter through which physical quantities are measured.

Physical quantities:

It is term through which law's of physics are expressed directly or indirectly..

Types of physical quantities:

There are two types of physical quantities

1.

Fundamental quantity:

It is basic unit which cannot be derive from other units.

2.

Derived quantity:

These units can be expressed in the term of Fundamental unit.

The seven fundamental physical quantities along with their units:

Length                                    meter

Mass                                       kilogram

Time                                       second

Temperature                          kelvin

Current                                   ampere

Amount of substance            mole

Luminous intensity                 candela

Dimensional formula of force:

$Force={mass}\times{acceration}\\\\and \ acceration=\frac{change \ in \ velocity}{time}\\\\Force=\frac{kg \times length}{sec^2}\\\\Force=\left[ M \ L \ T^{-2} \right]$

Hope it is clear to you.