Physics Formulas Flashcards
Power (force and volumes)
P=Fv, watt
Power (work and time)
P=W/t, watt
Power (current and resistance)
I²R, watt
Power (voltage and resistance)
V²/R, watt
Power (charge and voltage)
QV/t, watt
Frequency (unit)
1/T, Hz
Average velocity
s/t, ms^-1
Average acceleration
∆v/∆t, ms^-2
Uniformly accelerated motion (v)
u+at
Uniformly accelerated motion (s and a)
s=ut+1/2at²
Uniformly accelerated motion (s and 1/2)
s=(u+v)/2 * t
Uniformly accelerated motion (v and s)
v²=u²+2as
Momentum (p)
mv (v is velocity), kgms^-2
Conservation of linear momentum
maua + mbub = mava + mbvb, joules
Elastic collision (kinetic energy)
1/2 maua² + 1/2 mbub² = 1/2 mava² + 1/2 mbvb², joules
Inelastic collision
1/2 maua² + 1/2 mbub² > 1/2 mava² + 1/2 mbvb², joules
Weight
mg, N
Momentum & 2nd law of motion
F=(mv-mu)/t = ma
Rate of change of momentum is
equal to the net force applied
Density (m and V)
m/V (V is volume), kgm^-3
Pressure in fluids
rhogh ,pascal
Pressure
F/A, N/m²
Young’s Modulus
stress/strain or (F/A)/(x/L), N/m²
Velocity of a wave
f*lambda, m/s
Alpha decay
Proton 2, neutron 4
Beta-decay
Proton -1, same neutron number
Gamma decay
Only loss of energy
Strain energy (Area under force-extension graph)
1/2kx², joules
Potential divider
R2/(R1+R2) x V, voltage
Power (current and voltage)
IV, watt
Electric field intensity [between 2 parallel plates]
V/d, Vm^-1
Charge (Quit) [Q]
It, couloumbs
Efficiency
(Useful energy output/total energy output) x 100
∆Work (external work done by expanding gas) from area under graph
p∆ܳV
Torque
F*perpendicular d
Voltage (work and q)
W/Q
Resistance (resistivity)
(resistivity*L)/A
Gee Xander, ultra violent nannies fighting my right
Gamma rays, X-rays, UV rays, visible light,
Impulse (∆p)
Ft
Phase difference
amount of wave (1/2, 3,4) x 360
Path difference
amount of wave x lambda
Diffraction grating
lambda = slit width * fringe width / distance of slit to fringe or lambda = ax/D