            Speed and acceleration: where: v is velocity x is displacement (or distance) t is time a is acceleration Uniformly accelerated motion: where: v is final velocity u is initial velocity x is displacement (or distance) t is time a is acceleration Momentum and force: where: p is momentum m is mass F is force Δ is change inCircular motion: where: ω is angular velocity v is velocityT is period r is radius F is forcem is massWork and energy: where: g is gravitational field strength (9.81 N/kg) W is work PE is potential energy KE is kinetic energy m is massv is velocityh is height Δ is change inF is forcePower and efficiency: where: P is power Δ is change in F is forceW is work v  is velocity t is timeStress and strain: where: A is area e is extension l is length F is forceCurrent electricity: where: Q is charge I is current V is voltage R is resistance Є is the electro-motive force (e.m.f) Capacitors: where: C is capacitance d is distance V is voltage A is aread is distanceE is energyRadioactivity: where: I is intensity of radiation E is energy m is massT1/2 is half-lifec is light's speed (299 792 485 m/sec) λ is wavelength N is number of radioactive atoms Simple harmonic motion: where: T is period l is length of pendulum's string x is displacement moved by pendulum g is gravitational field strength ω is angular velocity v is velocity a is accelerationm is mass k is spring stifnessWaves: where: f is frequency s is fringe separation λ is wavelength D is distance to screen w is slit separation d is grate spacing c is velocity of waveRefraction: where: n is refractive index c is speed of light in a vacuum v is speed of light in material θ1 is angle of incidence θ2 is angle of refraction Photons and duality: where: Ek is kinetic energy E is energyf  is frequencyp is momentumh is Planck's constant Φ is work function for metalMagnetism: where: Φ is flux F is forceQ is chargev is velocity μ is the permeability of free space (constant) n is number of turns divided by length of coil B is field flux density I is current l is length of wire Induced Current: where: N is the number of turns of a coil  is the electro-motive force (e.m.f) L is the self-inductance (constant) A.c. and transformers: where: N/I/Vp is primary number of turns/current/voltage of transformer N/I/Vs is secondary number of turns/current/voltage of transformer r.m.s. is root mean square X is reactance w is angular frequency C is capacitance Gravitation: where: g is gravitational strength G is universal constant of gravitation V is gravitational potential Thermodynamics: where: c is specific heat capacity l is specific latent heat Q is amount of heat transferred T is temperature U is internal energy W is work done by a system k is Boltzman' constant Gases: where: p is pressure V is volume N is number of particles c is average speed of particles n is number of moles in a gas R is universal molar gas constant Electrostatics: where:F  is forceQ is charge r is distance between 2 charged objects ε0 is permittivity of free spaceE is energy V is voltaged is distance moved by chargeΔPE is change in potential