Equations

Question 1

Know and use the relationship between change in velocity, time taken and acceleration

Answer 1

change in velocity
acceleration= —————————
time taken
v-u
a = ——-
t

Question 2

What is the equation linking weight, mass and gravitational field strength

Answer 2

weight = mass x GFS
W = m x GFS

Question 3

Know the relationship between unbalanced force, mass and acceleration

Answer 3

Force = mass x acceleration F = m x a

Question 4

What is the relationship between power, current and voltage

Answer 4

power = current x voltage
P = I x V

Question 5

What is the relationship between voltage, energy transferred, time and current

Answer 5

energy transferred = current x voltage x time
E = I x V x t

Question 6

What is the relationship between voltage, resistance and current

Answer 6

V = I x R

Question 7

What is the relationship between charge, current and time

Answer 7

Charge = current x time
Q = I x t

Question 8

What is the relationship between charge, voltage and energy transferred

Answer 8

E = V x Q

Question 9

The relationship between the frequency and time period

Answer 9

Frequency = 1/time period

Question 10

What is the relationship between refractive index, angle of incidence and angle of refraction

Answer 10

n = sin i / sin r

Question 11

What is the relationship between critical angle and refractive index

Answer 11

sin c = 1/n

Question 12

What is the relationship between efficiency, useful energy output and total energy output

Answer 12

Efficiency =
useful energy output
———————— x 100% total energy input

Question 13

What is work done the equal to

Answer 13

Work done = Energy transferred

Question 14

What is the the relationship between force, work done and distance moved in the direction of the force

Answer 14

𝑤𝑜𝑟𝑘 𝑑𝑜𝑛𝑒 = 𝑓𝑜𝑟𝑐𝑒 × 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑚𝑜𝑣𝑒𝑑 𝑊 = 𝐹 × d

Question 15

the relationship between mass, gravitational field strength, height and gravitational potential energy

Answer 15

𝑔𝑟𝑎𝑣𝑖𝑡𝑎𝑡𝑖𝑜𝑛𝑎𝑙 𝑝𝑜𝑡𝑒𝑛𝑡𝑖𝑎𝑙 𝑒𝑛𝑒𝑟𝑔𝑦 = 𝑚𝑎𝑠𝑠 × 𝑔𝑟𝑎𝑣𝑖𝑡𝑎𝑡𝑖𝑜𝑛𝑎𝑙 𝑓𝑖𝑒𝑙𝑑 𝑠𝑡𝑟𝑒𝑛𝑔𝑡ℎ × ℎ𝑒𝑖𝑔ℎ𝑡
𝐺𝑃𝐸 = 𝑚 × 𝑔 × ℎ

Question 16

know this:

Answer 16

𝑘𝑖𝑛𝑒𝑡𝑖𝑐 𝑒𝑛𝑒𝑟𝑔𝑦 = ½ × 𝑚𝑎𝑠𝑠 × 𝑠𝑝𝑒𝑒𝑑2 𝐾𝐸 = 1/2 × 𝑚 × 𝑣 -> squared <—–I

Question 17

What is the relationship between power, work done (energy transferred) and time

Answer 17

𝑝𝑜𝑤𝑒𝑟 =
work done
——————-
time
W
P = ——-
t

Question 18

What is the equation for weight, mass and GFS

Answer 18

Weight = mass x gravitational field strength

Question 19

What is the equation for density, mass and volume

Answer 19

Density = mass / volume

Question 20

What is the equation for pressure, force and area

Answer 20

Pressure = Force / area

Question 21

what is the relationship between the volume and temperature of a fixed mass of gas at a constant volume

Answer 21

V1 V2
— = —
T1 T2

Question 22

what is the relationship between the pressure and volume of a fixed mass of gas at constant temperature

Answer 22

P1 x V1 = P2 x V2

Question 23

What is the equation relating to change in wavelength, reference wavelength, velocity of a galaxy and speed

Answer 23

Change in wavelength
——————————- = Reference wavelength

velocity of a galaxy / speed

Question 23

What is the relationship between orbital speed , orbital radius and time period

Answer 23

Orbital speed =
2 x PIE x orbital radius ——————————— Time period