Equations Flashcards
Know and use the relationship between change in velocity, time taken and acceleration
change in velocity
acceleration= —————————
time taken
v-u
a = ——-
t
What is the equation linking weight, mass and gravitational field strength
weight = mass x GFS
W = m x GFS
Know the relationship between unbalanced force, mass and acceleration
Force = mass x acceleration F = m x a
What is the relationship between power, current and voltage
power = current x voltage
P = I x V
What is the relationship between voltage, energy transferred, time and current
energy transferred = current x voltage x time
E = I x V x t
What is the relationship between voltage, resistance and current
V = I x R
What is the relationship between charge, current and time
Charge = current x time
Q = I x t
What is the relationship between charge, voltage and energy transferred
E = V x Q
The relationship between the frequency and time period
Frequency = 1/time period
What is the relationship between refractive index, angle of incidence and angle of refraction
n = sin i / sin r
What is the relationship between critical angle and refractive index
sin c = 1/n
What is the relationship between efficiency, useful energy output and total energy output
Efficiency =
useful energy output
———————— x 100% total energy input
What is work done the equal to
Work done = Energy transferred
What is the the relationship between force, work done and distance moved in the direction of the force
𝑤𝑜𝑟𝑘 𝑑𝑜𝑛𝑒 = 𝑓𝑜𝑟𝑐𝑒 × 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑚𝑜𝑣𝑒𝑑 𝑊 = 𝐹 × d
the relationship between mass, gravitational field strength, height and gravitational potential energy
𝑔𝑟𝑎𝑣𝑖𝑡𝑎𝑡𝑖𝑜𝑛𝑎𝑙 𝑝𝑜𝑡𝑒𝑛𝑡𝑖𝑎𝑙 𝑒𝑛𝑒𝑟𝑔𝑦 = 𝑚𝑎𝑠𝑠 × 𝑔𝑟𝑎𝑣𝑖𝑡𝑎𝑡𝑖𝑜𝑛𝑎𝑙 𝑓𝑖𝑒𝑙𝑑 𝑠𝑡𝑟𝑒𝑛𝑔𝑡ℎ × ℎ𝑒𝑖𝑔ℎ𝑡
𝐺𝑃𝐸 = 𝑚 × 𝑔 × ℎ
know this:
𝑘𝑖𝑛𝑒𝑡𝑖𝑐 𝑒𝑛𝑒𝑟𝑔𝑦 = ½ × 𝑚𝑎𝑠𝑠 × 𝑠𝑝𝑒𝑒𝑑2 𝐾𝐸 = 1/2 × 𝑚 × 𝑣 -> squared <—–I
What is the relationship between power, work done (energy transferred) and time
𝑝𝑜𝑤𝑒𝑟 =
work done
——————-
time
W
P = ——-
t
What is the equation for weight, mass and GFS
Weight = mass x gravitational field strength
What is the equation for density, mass and volume
Density = mass / volume
What is the equation for pressure, force and area
Pressure = Force / area
what is the relationship between the volume and temperature of a fixed mass of gas at a constant volume
V1 V2
— = —
T1 T2
what is the relationship between the pressure and volume of a fixed mass of gas at constant temperature
P1 x V1 = P2 x V2
What is the equation relating to change in wavelength, reference wavelength, velocity of a galaxy and speed
Change in wavelength
——————————- = Reference wavelength
velocity of a galaxy / speed
What is the relationship between orbital speed , orbital radius and time period
Orbital speed =
2 x PIE x orbital radius ——————————— Time period
