Physics Formulae

Speed : Distance(m) / Time(s)
Units: m/s (metres per second)
Memory Aid : Dads Silly Triangle (Distance / Speed X Time)
Velocity is speed in a given direction. The units for velocity is m/s.

Acceleration : Change in velocity(m/s) / time takenn(s)
Or V2 - V1 / t
V1 = initial velocity
V2 = final velocity
t - time taken
Units : m/s/s or m/s2

Density : mass(g) / volume(cm3)
Unit : g/cm3
Memory aid: My Dear Vera ( Mass / Density X Volume)

Work : Force(N) X Distance(cm)
Units : Joules

Power : Work done(j) / time taken(s)
Units W (Watts)

Weight : Weight is a forced measured in N
Mass(kg) X 10N/kg (earths gravity) (1.67 N/kg on moon) (O gravity in space)

Moment of a force : Force X Perpendicular distance from force to fulcrum
Units : Moments

Pressure : Force(N) / Area(m2)
Units : Pa / Pascals

Speed of Sound (340m/s) : Distance(cm) / Time (s)

Current, voltage, resistance:
V = Voltage (Volts)
I = Current (Amps)
R = Resistance (Ohms)
Memory aid : Very Important Rule (Voltage/ Current X Resistance)
Ohms law at constant temperature voltage is proportional to current in a circuit