Equations Flashcards

1
Q

Speed

A

D/t

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2
Q

Acceleration

A

Change in velocity/time

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3
Q

Moment

A

Force x perpendicular distance

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4
Q

Weight

A

Mas x gravity

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5
Q

Impulse

A

Force x time =change in momentum

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6
Q

Momentum

A

Mass x velocity

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7
Q

Force

A

Mass x acceleration

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8
Q

Conservation of momentum

A

Mass x (change in velocity/time) = -mass x (change in velocity/ time)

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9
Q

Hookes law

A

F=kx or =ke

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10
Q

Work done or stored in a spring

A

W=1/2 x k x e^2

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11
Q

Kinetic energy

A

1/2x mass x velocity^2

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12
Q

Gravitattional potential

A

Mass x gravity x change in height

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13
Q

Pressure

A

F/a

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14
Q

Pressure in liquid

A

P=hpg=depth x density x gravity

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15
Q

Density

A

Mass/vol

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16
Q

Thermal capacity

A

Mass x specific heat capacity= mc

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17
Q

Change in energy when heating

A

Mass x specific heat capacity x change in temp

18
Q

Energy to change state

A

Mass x specific latent heat

19
Q

Frequency (of a wave)

A

1/time period (S)

20
Q

Speed of a wave

A

Wavelength (m) x frequency (/s)

21
Q

Refractive index

A

= speed of light in vacum/ speed of light in medium= c/v
=sini/sinr=
=n1sin01=n2sin02
=1/sin(critical angle)

22
Q

Charge

23
Q

V=

24
Q

Power

25
Energy
Ivt= qv= charge x pd
26
Series voltage
Vtot=v1+v2
27
Current in series
Itot= I1=I2
28
Resistance in series
Rtot=R1+R2
29
Voltage in parallel
Vtot=V1+V2
30
Current in parallel
Itot=I1+I2
31
Resistance in parallel
1/Rtot=1/R1 +1/R2
32
Resistive heating
P=I^2 X R
33
Power in transformers
Pp=Ps | IpVp=IsVs
34
Number of turns in coil - transformers
Np/Ns=Vp/Vs
35
Right thumb rule
Thumb=direction of current | Curled hand=magnetic field (in concentric circles)
36
Left hand rule
Motor : thumb= force (movement) 1st finger= field direction 2nd finger= current direction
37
Right hand rule
Generator: Thumb= motion 1st finger= field direction 2nd finger= current direction
38
1 watt
1 joule
39
1Nm
1 joule
40
1 joule
1 watt/Nm
41
Voltage in potential divider circuit
Vout=Vin x (R/Rtot)