# Equations for Leaving Cert Physics

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v = u + at – velocity

ma – Force

Fd – Torque

mv – Momentum (p)

½mv² – Kinetic Energy

mgh – Potential Energy

Fs – Work

W/t – Power

kx – Force of Spring

1/f – Period (f=frequency)

Gmm/r² – Force of gravity between two masses

E/q – Force on charge by electric field

F/q – Electric field

W/Q – Potential difference

Q/V – Capacitance (C)

RA/l – Resistivity

IR – Potential Difference (V)

IV – Power (terms of voltage)

I²R – Power (terms of resistance)

R tot=R₁+R₂+R₃…. – Total Resistance (Series)

(1/R₁)+(1/R₂)+(1/R₃)+…=(1/Rtotal) – Total Resistance in Parallel

Bev – Force of B field on charged particle

BI L – Force of B field on wire

BA – Magnetic Flux

þgh – Pressure in a liquid

F/A – Pressure

hf – energy (wave)

hf-work function – Kinetic Energy

v/λ – Wavelength

mc² – Energy ( with ref to c)

fλ – velocity of a wave

sin i /sin r – index of refraction (n)

1/n – sin of critical angle C

(1/u)+(1/v)=1/f – Mirors and lenses

s = ut + ½at² – distance in terms of u, t and a

v² = u² + 2as – velocity in terms of u, s and a

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂ – Conservation of momentum

s/r – Angle in radians θ

θ/t – Angular Velocity

v = rω – Relationship between linear velocity and angular velocity

rω² = v²/r – Centripetal acceleration

mrω² = (mv²)/r – Centripetal force

mg – Weight

Gm₁m₂/d² – Newton’s law of gravitation

GM/R² – g in terms of M and R

4π²R³ / GM –

m/V – Density

pV=constant – Boyle’s law

Fs – Moment

Fd – Couple