Last saved by: Alan Wallis

List of data, formulae and relationships Unit 1

Mechanics
	Kinematic equations of motion	v = u + at
		s = ut + ½at^2
		v^2 = u^2 + 2as
	Forces	ΣF = ma
		g = F/m
		W = mg
	Work and energy	ΔW = FΔs
		E_k = ½ mv^2
		ΔE_grav = mgΔh
	Materials
	Stokes’ law	F = 6πηrv
	Hooke’s law	F = kΔx
	Density	ρ = m/V
	Pressure	p = F/A
	Young’s modulus	E = σ/ε where
		Stress σ = F/A
		Strain ε =Δ x/x
	Elastic strain energy	E_el = ½ Fx
Appendix 8 Formulae
	Data
	Acceleration of free fall	g = 9.81 m s^–2	(close to Earth’s surface)
	Boltzmann constant 	k = 1.38 × 10^–23 J K^–1
	Coulomb’s law constant	k = 1/4 
		   = 8.99 × 10^9 N m^2 C^–2
	Electron charge	e = –1.60 × 10^–19– C
	Electron mass	m_e = 9.11 × 10^–31 kg
	Electronvolt	1 eV = 1.60 × 10^–19 J
	Gravitational constant	G = 6.67 × 10^–11 N m^–2 kg^–2
	Gravitational field strength	g = 9.81 N kg^–1	(close to Earth’s surface)
	Permittivity of free space	= 8.85 × 10^–12 F m^–1
	Planck constant 	h = 6.63 × 10^–34 J s
	Proton mass	m_p = 1.67 × 10^–27 kg
	Speed of light in a vacuum	c = 3.00 × 10^8 m s^–1
	Stefan Boltzmann constant	5.67 × 10^–8 W m^–2 K^–4
	Unified atomic mass unit	u = 1.66 × 10^–27 kg

Sibford School