Formulas Flashcards
Speed
=Distance/time or v=s/t
Resultant force
=Mass x acceleration or F=ma
Acceleration
=Change in velocity/time or a=(v-u)/t
Density
=Mass/volume or ρ=m/V
Work done
=Force x distance moved in direction of force or W=Fs
=Energy transfered
Kinetic energy
=1/2 x mass x velocity^2 or KE=1/2mv^2
Gravitational potential energy
=mass x g x height or GPE=mgh
Weight
=mass x g or W=mg
Pressure
=force/area or P=F/A
Pressure difference
=density x gravity x height difference or 𝚫p= ρg 𝚫h
Charge
=current x time Q=It
Voltage
=current x resistance V=IR
Electrical power
=voltage x current, P=VI
Energy transferred
=charge x voltage, E=QV or
= current x voltage x time, E=IVt
Wave speed
= frequency x wavelength, v=f λ
frequency
=1/time period, f=1/t or
= wave speed/ wavelength, f=v/λ
Efficiency
=(useful energy output/total energy input) x 100%
Refractive index
=sin(incidence angle)/sin(refraction angle), n=sin(i)/sin(r)
Power
=energy/time P=E/t (work done=energy transferred)
Momentum
= mass x velocity
P=mv (Kgm/s)
Final speed
(Final speed)^2=(initial speed)^2+(2 x acceleration x distance moved)
V^2=u^2+(2 x a x s)
Equation linking pressure tempreture and constant of a gas
Pressure/temp=constant
p1/T1=p2/T2
Equation linking pressure volume and constant of a gas
Pressure x volume = constant
p1 x V1 = p2 x V2
