Calculation Revision Flashcards
average speed=
(distance moved)/(time taken)
acceleration=
(change in velocity)/(time taken)
a= (v-u)/t
force
=mass×acceleration
F=m × a
weight
=mass ×gravitational field strength
W=m×g
momentum
=mass×velocity
p=m×v
force=
(change in momentum / time taken)
F=(mv-mu)/t
power(electricity)
=current×voltage
P=I×V
voltage
=current×resistance
V=I×R
charge
=current×time
Q=I×t
Energy transferred(charge)
=Charge×Voltage
E=Q×V
energy transferred(I.T.V)
=current×voltage×time
E=I×V×t
efficiency
=(useful energy output / total energy input)
work done
=force×distance moved
W=F×d
gravitational potential energy
=mass×gravitational field strength×height
E_g=m×g×h
kinetic energy
=1/2×mass×speed^2
=1/2×m×v^2
Power(forces)
(Work done / time taken) =
(Energy Transferred / time taken)
P=W/t
wave speed=
frequency×wavelength
v=f×λ
refractive index
n=sin i / sin r
Critical angle
sinC= 1/n
frequency=
1 / time period)
f=1/T
density=
mass/volume
ρ=m/V
pressure=
force/area
p= F/A
pressure difference=
height×density×gravity
p=h×ρ×g
Energy change =
mass x specific heat capacity x change in temperature
∆Q=m ×c ×∆t
pressure×volume=constant
p1×V1=p2×V2
pressure/temperature=constant
p1 / T1 =p2 / T2
(primary voltage / secondary voltage)=(primary turns / secondary turns)
Vp / Vs =Np / Ns
input power=output power
Vprimary × Iprimary=Vsecondary × Isecondary
for 100% efficiency
