Formulae Flashcards

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1
Q

Density =

A

Mass /volume

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2
Q

speed =

A

Distance/ time

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3
Q

Average speed

A

total distance/ total time

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4
Q

acceleration

A

Change in velocity/ time

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5
Q

spring constant

A

force/ extension

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6
Q

force

A

mass x acceleration

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7
Q

moment of a force

A

force x perpendicular distance

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8
Q

impulse

A

force x time

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9
Q

resultant force

A

change in momentum / change time

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10
Q

kinetic energy

A

half mass x velocity squared

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11
Q

Gravitational potential energy

A

Mass x gravity x height

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12
Q

work

A

force x distance travelled in direction of force

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13
Q

percentage efficiency

A

(Useful output / total input) x 100

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14
Q

power

A

work/time

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15
Q

pressure (liquid)

A

height x density x gravity

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16
Q

pressure

A

force/ area

17
Q

temp (kelvin)

A

temp in celcius + 273

18
Q

specific heat capacity

A

change in energy / mass x temp

19
Q

speed of light

A

3.0 × 10 to the 8 m/s

20
Q

human audio freq

A

20 to 20 000Hz

21
Q

speed of sound in air

A

330-350m/s

22
Q

Charge

A

current x time

23
Q

e.m.f

A

Work/ charge

24
Q

Voltage

A

Current x resistance

25
Q

Power

A

Current x Voltage

26
Q

Energy transferred

A

current x voltage x time

27
Q

potential divider resistors

A

R1 / R2 =V1 /V2

28
Q

Power loss

A

Current squared x resistance

29
Q

transformer

A

primary coil voltage /second coil voltage = turns on primary coil / turns on second coil

30
Q

hubble

A

2.2 x 10 to the -18 per second

31
Q

age of universe

A

1/ speed /( 60sx60 minx 24h x 364.25)