Q. What base quantities are involved in these derived physical quantities; force, pressure, power, and charge. 


Answer:


(a) Force:


Force F = ma

SI Unit of force is Newton (N) = kg m s⁻²

Base quantities involved in force are mass, length, and time.


(b) Pressure


Pressure = force/area

Pressure = F / A

The SI unit of force (F=ma) is Newton N = kg m s⁻² and the unit of area A is m² 

The SI Unit of Pressure is Pascal "Pa" = kg m s⁻² / m² = kg m⁻¹ s⁻²

So, the Base quantities involved in Pressure are Mass, length, and time.


(c) Power


Power = work/time

Power = W / t

The SI unit of Work (W=F.d) is joule (J) = kg m² s⁻² and unit of time is second (s) 

The SI Unit of Power is Watt "W" = kg m² s⁻² / s = kg m² s⁻³


So, the Base quantities involved in Power are Mass length and time.



(d) Charge:

Charge = Electric Current x change in time


Q = `\I` t


Si Unit of charge is Coulomb (C) = A s 


Base quantities involved in work are Electric current, and time.


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