Formulas

Let's study

Density

(Mass/volume)Kg/m³

Velocity

(Displacement/ Time)m/s

Acceleration

(Change in velocity/Time)m/s²

Gravitational field strength

(Weight/Mass)N

Force

(Mass x Acceleration)N

Momentum

(Mass x Velocity)Kgm/s

Impulse(change in monetum)

(Force x time)kgm/s²

Impulse(change in momentum)

(Mass x (change in velocity))Kgm/s

Resultant Force

(Change in Momentum/Time)N

Moment

(Force x perpendicular distance from the pivot)Nm

Length of stretched spring

Original length + Extension

Spring constant

(Force/Unit extension)N/cm

Pressure

(Force(N)/Area(m²)Pa

Change in pressure

(Density(Kg/m³) x Acceleration due to gravity(9.81) x Depth(m)Pa

Efficiency

(Useful energy output/Total energy output)No unit

Percentage Efficiency

((Useful energy output/Total energy output) x 100 )%

Change in GPE

(Weight x change in height)J

Kinetic Energy

(½ x Mass x Speed²)J

Work done

(Force x distance moved in the direction of force)Nm

Power(watts)

(work done / time taken ) W

Kelvin

273 + θ Celcius

Constant

Pressure x volume

Specific heat capacity

((Energy required) / (Mass x temperature increase)) J / Kg C

Refractive index

Sin i / Sin r

Refractive index

3 × 10^8 / Speed in medium

Refractive index

1/ sin c

Wave speed

Frequency x wavelength

Curent

Charge/time(s) I = Q/t

Potential diference

Work done by the charge / Charge V= W/Q

Electromotive force

Work done on the charge/ charge E=W/Q

Resistance

p.d /curent R= V/I

Power

Current x p.d P = IV

Energy transferred

Curent x p.d x time(s) E= IVt

Energy transferred

Power x time Kwh =Kw x hours

Series circuit

Parallel circuit

Formula for step up step down transformer

Voltage in primary coil / Voltage in secondary coil
=
Number of turns in primary coil / Number of turns in secondary coil

Transformer

IpVp = IsVs

power loss

Current² x resistance

Velocity of planets

2pier / T(orbital period)

Hubble constant

(velocity /distance) s^-1
2.2 × 10^-18

Age of universe

1/ Ho (2.2 × 10 ^-18)