Physics Equations

Question 1

State the relationship between average speed, distance moved and time taken

Answer 1

average = distance moved / time taken

Question 2

State the relationship between acceleration, change in velocity and time taken

Answer 2

acceleration = change in velocity / time taken

or

a = (v-u) / t

Question 3

State the relationship between final speed, initial speed, acceleration and distance moved

Answer 3

(final speed)² = (initial speed)² + (2 x acceleration x distance moved)

or

v² = u² + (2 x a x s)

Question 4

State the relationship between force, mass and acceleration

Answer 4

Force = mass x acceleration

or

F = ma

Question 5

State the relationship between weight, mass and g.

Answer 5

weight = mass x g

or

W = m x g

Question 6

State the relationship between momentum, mass and velocity.

Answer 6

momentum = mass x velocity

or

p = m x v

Question 7

State the relationship between force, change in momentum and time taken

Answer 7

force = change in momentum / time taken

or

F = (mv-mu)/t

Question 8

State the relationship between moment, force and perpendicular distance from pivot.

Answer 8

moment = force x perpendicular distance from pivot

Question 9

State the relationship between power, current and voltage.

Answer 9

power = current x voltage

or

P = I x V

Question 10

State the relationship between energy transferred, current, voltage and time

Answer 10

energy transferred = current x voltage x time

or

E = I x V x t

Question 11

State the relationship between voltage, current and resistance

Answer 11

voltage = current x resistance

or

V = I X R

Question 12

State the relationship between charge, current and time

Answer 12

Charge = current x time

or

Q = I x t

Question 13

State the relationship between voltage , energy and charge.

Answer 13

voltage = energy / charge

or

V = E/Q

Question 14

State the relationship between wave speed, frequency and wavelength

Answer 14

wave speed = frequency x wavelength

or

v = f x λ

Question 15

State the relationship between frequency and time period.

Answer 15

frequency = 1 / time period

or f = 1/T

Question 16

State the relationship between the refractive index and the angles of incidence and refraction.

Answer 16

n = sin i / sin r

Question 17

State the relationship between the critical angle and the refractive index.

Answer 17

sin c = 1 / n

Question 18

State the equation for efficiency.

Answer 18

efficiency = (useful energy output / total energy input) x 100%

Question 19

State the relationship between work done, force and distance moved.

Answer 19

work done = force x distance moved

or

W = F x d

Question 20

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

Answer 20

gravitational potential energy = mass x gravitational field strength x height.

or

GPE = mgh

Question 21

State the relationship for kinetic energy, mass and speed

Answer 21

kinetic energy = 1/2 x mass x speed²

or

KE = 1/2 x m x v²

Question 22

State the relationship between power, work done and time taken

Answer 22

Power = work done / time taken

or

P = W/t

Question 23

State the relationship between density, mass and volume.

Answer 23

density = mass / volume

or

ρ = E/A

Question 24

State the relationship between pressure difference, height, density and gravitational field strength

Answer 24

pressure difference = height x density x gravitational field strength

or

p = h x ρ x g

Question 25

State the relationship between change in thermal energy, mass, specific heat capacity and change in temperature

Answer 25

change in thermal energy = mass x specific heat capacity x change in temperature

or

ΔQ = m x c x ΔT

Question 26

State the relationship between pressure and temperature.

Answer 26

p1/T1 = p2/T2

Question 27

State the relationship between pressure and volume.

Answer 27

p1V1 = p2V2

Question 28

State the relationship between input and output voltage; and primary and secondary turns

Answer 28

input voltage / output voltage = primary turns / secondary turns

Vp/Vs = np/ns

Question 29

State the relationship between input power and output power

Answer 29

for 100% efficiency:
input power = output power

or

VpIp = VsIs

Question 30

State the relationship between orbital speed, orbital radius and time

Answer 30

orbital speed = 2 x π x orbital radius / time period

or

v = 2 x π x r / T

Question 31

State the relationship between change in wavelength, reference wavelength, velocity of a galaxy and speed of light.

Answer 31

change in wavelength / reference wavelength = velocity of a galaxy / speed of light

or

λ - λ0 / λ0 = Δλ / λ0 = v/c