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Physics IGCSE > Formulas > Flashcards

Formulas Flashcards

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1
Q

How to find density ?

A

density= mass/ volume

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2
Q

How to find speed and average speed

A

Speed = Distance/ Time

Average speed= Total distance travelled / Total time taken

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3
Q

how to find acceleration

A

Acceleration= Change in velocity/ Change in time

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4
Q

How to find centripetal acceleration (the rate of motion of an object inwards towards the center of a circle.)

A

a(c) = v^2/r

a(c) = centripetal acceleration
v = velocity
r = radius

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5
Q

how do you find weight

A

weight = mass x gravity

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6
Q

what is the formula for force?

A

F = ma

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7
Q

how do you find the spring constant

A

k = f/x

k= spring constant
f = force
x = the extension

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8
Q

what is the formula for the moment of a force ?

A

Moment of a force = Force × Perpendicular distance from the pivot

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9
Q

what is the formula for impulse

A

Impulse = Force x Time

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10
Q

what are the two equations to find the change in momentum

A
  1. Δp = m Δv

where,
Δp is the change in momentum,
m is the mass of object,
Δv is the change in velocity of object.

  1. Δp = F Δt

where,
Δp is the change in momentum,
F is the force applied on the body,
Δt is the time interval for which force acts on the object.

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11
Q

how to calculate resultant force ?

A

Resultant force = Change in momentum / Change in time

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12
Q

how to find the kinetic energy

A

Kinetic energy= 0.5 m v^2

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13
Q

what is the formula for potential energy

A

Potential energy = mgh

m= mass
g= gravity
h= height

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14
Q

what is the formula for work

A

Work = Force x Distance travelled in the direction of the force

w=fd in short

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15
Q

how to calculate percentage efficiency ?

A

Percentage efficiency = [ Useful energy output / Total energy input] x 100

OR

Percentage efficiency = [ Useful power output / Total power input] x 100

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16
Q

WHAT ARE THE TWO FORMULAS FOR POWER ?>!>?#l!p@#l!

A

Power= Work done / Time taken

Power= Energy transferred / Time taken

17
Q

what is pressure ? (TWO FORMULAS !!)

A

Pressure = Force / Area

Pressure = Height x Density x gravitational field strength

18
Q

how to calculate change in thermal energy

A

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

19
Q

what is the wave equation mamacitas ؟

A

Wave Equation :

velocity = frequency x wavelength

20
Q

how to find the refractive index when “i” and “r” are known ?

A

Refractive Index (n)= Sin(i)/Sin(r)

21
Q

how to find the refractive index when the critical angle is known ?

A

Refractive Index (n) = 1/Sin(c)

22
Q

what is the value of the speed of light ?

A

peed of light : 3.0 × 10^8m/s

23
Q

the value of Human Audio Frequency?

A

the value of Human Audio Frequency : 20 Hz to 20 000 Hz

24
Q

the value of speed of sound in air?

A

the value of speed of sound in air : 330–350 m/s

25
Q

how to find electric current

A

I = Q/T

i = current (in amps)
q = the charge (in coulombs)
t = time (in seconds)

26
Q

how to find voltage (two formulas)

A
  1. Voltage (V) = energy transferred (J) / charge (C)

V = E/Q

  1. Voltage (V) = current (A) × resistance (Ω)

V = IR

27
Q

what are the two formulas for power

A
  1. Power (W) = current (A) × voltage (V)

P = IV

  1. Power (W) = current^2 (A) × resistance (Ω)

P = I^2R

28
Q

give me the two formulas for energy transferred

A
  1. Energy transferred (J) = current (A) × voltage (V) × time (s)

ΔE = IVt

  1. Energy transferred (J) = power (W) × time (s)

ΔE = Pt

29
Q

how to calculate the resistance

A

Resistance (Ω) = resistivity (Ωm) × length (m) area (m^2)
Note: since wires have a circular cross section, area = π × radius^2

OR

R = V/I (Volts divided by amps)

30
Q

formula for transformers ? (two)

A

Transformers:
1. voltage in secondary coil/voltage in primary coil = current in secondary coil/current in primary coil

  1. voltage in primary coil/voltage in secondary coil = current in secondary coil/current in primary coil

Physics IGCSE (1 decks)

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