Acceleration:
a=Fresultant/m
a=(v-u)/∆time
Momentum formula:
p=m x v
F=mv-mu/t
F=p/t
F= m x a
GPE=mgh
KE=1/2*mv2
efficiency=useful out / total input
work done(Joules or Nm) = force × distance
moved
W = F× d=P*time
in electricity Heat = Work = Energy - IVt
power(watts) = energy transferred /time taken
P= W/t in electricity P=IV
Pressure = Force/Area
P=F/A
Unit: Pa(1000Pa=1kPa)
Pressure In liquids
Pressure=Height x Density x Gravitational
Field strength
pliquid = ρ*g*h
Spring formula(Hooke’s Law)
F=kx
Boyle’s Law:
p1xV1=p2xV2
V=volume
p=pressure
Thermal(Heat) Capacity:
C=m*c
c is specific heat capacity C is
thermal capacity
Specific Heat Capacity:
E change = m x c x change T
c = Heat supplied to substance/m x change T
WaveSpeed = WaveLength x Frequency
Current = Voltage / Resistance
I = V/R
Current = Charge / change in time
I = Q / delta time
Power = Voltage x Current = Energy / time
P=VxI
P=W/t=E/t
Power = Current x Resistance ^2
P = I x R^2
Energy = Work = Current x Voltage x time =
Power x time
E=W=IxVxt=Pxt
EMF = Work / Charge
emf = W / Q
EMF = sum of pd’s
Hand Rules
● Fleming’s Left hand rule (FLHR)
next page too!!!
● Right
Hand
Rotation
Rule
● Right Hand Grid Rule
● Fleming’s Right Hand Rule (FRHR)
X (cross) is used to show as going INSIDE
● (dot) is used to show as going OUTSIDE
For DC motor – FLHR and positive
particles (alpha, proton)
For AC motor – FRHR and negative
particles (beta and electron)