# Equations Flashcards

1
Q

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

A

distance travelled = average speed × time

d = s x t

2
Q

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

A

acceleration = change in velocity ÷ time taken

a = (v – u)

t

3
Q

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

A

force = mass × acceleration

F = m × a

4
Q

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

A

weight = mass × gravitational field strength

W = m × g

5
Q

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

A

momentum = mass × velocity

p = m × v

6
Q

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

A

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

E = F x d

7
Q

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

A

kinetic energy = ½ × mass × (velocity)2

KE = ½ × m × v2

8
Q

What is the equation for efficiency?

A

(useful energy transferred by the device)

(total energy supplied to the device)

9
Q

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

A

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

ΔGPE = m × g × Δh

10
Q

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

A

wave velocity = frequency x wavelength

v = f x λ

11
Q

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

A

wave speed = distance

time

v = d

t

12
Q

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

A

power = work done ÷ time taken

P = E

t

13
Q

What is the equation for moment of a force?

A

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

14
Q

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

A

charge = current × time

Q = I x t

15
Q

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

A

energy transferred = charge moved × potential difference

E = Q × V

16
Q

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

A

potential difference = current × resistance

V = I x R

17
Q

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

A

electrical power = current × potential difference

P = I x V

18
Q

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

A

electrical power = current squared × resistance

P = I2 x R

19
Q

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

A

density = mass ÷ volume

ρ = m

V

20
Q

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

A

force exerted on a spring = spring constant × extension

F = k × x

21
Q

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

A

pressure = force normal to surface ÷ area of surface

P = F

A

22
Q

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

A

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

v2 – u2 = 2 × a × x

23
Q

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

A

force = change in momentum ÷ time

F = (mv – mu)

t

24
Q

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

A

energy transferred = current × potential difference × time

E = I x V x t

25
Q

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)

A

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

F = B × I × L

26
Q

Voltage across primary coil = ?

Voltage across secondary coil

A

voltage across primary coil = number of turns in primary coil

voltage across secondary coil number of turns in secondary

Vp = Np

Vs Ns

27
Q

(pd × current) in primary coil = ?

A

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

Vp × Ip = Vs × Is

28
Q

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

A

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

ΔQ = m × c × Δθ

29
Q

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

A

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

Q = m × L

30
Q

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

A

P1 x V1 = P2 x V2

31
Q

Energy transferred in stretching = ?

A

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

E = ½ × k × x2

32
Q

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

A

pressure due to a column of liquid =

height of column × density of liquid × gravitational field strength

P = h × ρ × g