Equations

Question 1

What is the equation that links distance travelled, average speed and time?

Answer 1

distance travelled = average speed × time

d = s x t

Question 2

What is the equation that links acceleration, change in velocity and time taken?

Answer 2

acceleration = change in velocity ÷ time taken

a = (v – u)

t

Question 3

What is the equation that links force, mass and acceleration?

Answer 3

force = mass × acceleration

F = m × a

Question 4

What is the equation that links weight, mass and gravitational field strengh?

Answer 4

weight = mass × gravitational field strength

W = m × g

Question 5

What is the equation that links momentum, mass and velocity? (Higher)

Answer 5

momentum = mass × velocity

p = m × v

Question 6

What is the equation that links work done, force and distance moved in the direction of the force?

Answer 6

work done = force × distance moved in the direction of the force

E = F x d

Question 7

What is the equation that connects kinetic energy, mass and velocity?

Answer 7

kinetic energy = ½ × mass × (velocity)²

KE = ½ × m × v²

Question 8

What is the equation for efficiency?

Answer 8

(useful energy transferred by the device)

(total energy supplied to the device)

Question 9

What is the equation that links gravitational potential energy, mass, gravitational field strength and change in vertical height?

Answer 9

gravitational potential energy = mass × gravitational field strength x change in vertical height

ΔGPE = m × g × Δh

Question 10

What is the equation that links wave velocity, frequency and wavelength?

Answer 10

wave velocity = frequency x wavelength

v = f x λ

Question 11

What is the equation that connects wave speed, distance and time?

Answer 11

wave speed = distance

time

v = d

t

Question 12

What is the equation that connects power, work done and time taken?

Answer 12

power = work done ÷ time taken

P = E

t

Question 13

What is the equation for moment of a force?

Answer 13

moment of a force = force × distance normal to the direction of the force

Question 14

What is the equation that connects charge, current and time?

Answer 14

charge = current × time

Q = I x t

Question 15

What is the equation that connects energy transferred, charge moved and potential difference?

Answer 15

energy transferred = charge moved × potential difference

E = Q × V

Question 16

What is the equation that connects potential difference, current and resistance?

Answer 16

potential difference = current × resistance

V = I x R

Question 17

What is the equation that connects electrical power, current and potential difference?

Answer 17

electrical power = current × potential difference

P = I x V

Question 18

What is the equation that connects electrical power, current and resistance?

Answer 18

electrical power = current squared × resistance

P = I² x R

Question 19

What is the equation that links density, mass and volume?

Answer 19

density = mass ÷ volume

ρ = m

V

Question 20

What is the equation that links force exerted on a spring, spring constant and extension?

Answer 20

force exerted on a spring = spring constant × extension

F = k × x

Question 21

What is the equation that links pressure, force normal to a surface and area of surface?

Answer 21

pressure = force normal to surface ÷ area of surface

P = F

A

Question 22

What is the equation that links final velocity, initial velocity, acceleration and distance?

Answer 22

(final velocity)² – (initial velocity)² = 2 × acceleration × distance

v² – u² = 2 × a × x

Question 23

What is the equation that links force, change in momentum and time? (Higher)

Answer 23

force = change in momentum ÷ time

F = (mv – mu)

t

Question 24

What is the equation that links energy transferred, current, potential difference and time?

Answer 24

energy transferred = current × potential difference × time

E = I x V x t

Question 25

What is the equation that connects force on conductor at right angle to a magnetic field carrying a current, magnetic flux density, current and length? (Higher)

Answer 25

force on conductor at right angle to a magnetic field carrying a current = magnetic flux density × current × length

F = B × I × L

Question 26

Voltage across primary coil = ?

Voltage across secondary coil

Answer 26

voltage across primary coil = number of turns in primary coil

voltage across secondary coil number of turns in secondary

V_p = N_p

V_s N_s

Question 27

(pd × current) in primary coil = ?

Answer 27

(pd × current) in primary coil = (pd × current) in secondary coil

V_p × I_p = Vs × I_s

Question 28

What is the equation that connects change in thermal energy, mass, specific heat capacty and change in temperature?

Answer 28

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

ΔQ = m × c × Δθ

Question 29

What is the equation that links thermal energy for a change of state, mass and specific latent heat?

Answer 29

thermal energy for a change of state = mass × specific latent heat

Q = m × L

Question 30

How do you calculate pressure or volume for gases of fixed mass at a constant temperature?

Answer 30

P₁ x V₁ = P₂ x V₂

Question 31

Energy transferred in stretching = ?

Answer 31

energy transferred in stretching = 0.5 × spring constant × (extension)²

E = ½ × k × x²

Question 32

What is the equation that links pressure due to a column of liquid, height of column, density of liquid and gravitational field strengh?

Answer 32

pressure due to a column of liquid =

height of column × density of liquid × gravitational field strength

P = h × ρ × g