Equations

Question 1

Speed

Answer 1

D/t

Question 2

Acceleration

Answer 2

Change in velocity/time

Question 3

Moment

Answer 3

Force x perpendicular distance

Question 4

Weight

Answer 4

Mas x gravity

Question 5

Impulse

Answer 5

Force x time =change in momentum

Question 6

Momentum

Answer 6

Mass x velocity

Question 7

Force

Answer 7

Mass x acceleration

Question 8

Conservation of momentum

Answer 8

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

Question 9

Hookes law

Answer 9

F=kx or =ke

Question 10

Work done or stored in a spring

Answer 10

W=1/2 x k x e^2

Question 11

Kinetic energy

Answer 11

1/2x mass x velocity^2

Question 12

Gravitattional potential

Answer 12

Mass x gravity x change in height

Question 13

Pressure

Answer 13

F/a

Question 14

Pressure in liquid

Answer 14

P=hpg=depth x density x gravity

Question 15

Density

Answer 15

Mass/vol

Question 16

Thermal capacity

Answer 16

Mass x specific heat capacity= mc

Question 17

Change in energy when heating

Answer 17

Mass x specific heat capacity x change in temp

Question 18

Energy to change state

Answer 18

Mass x specific latent heat

Question 19

Frequency (of a wave)

Answer 19

1/time period (S)

Question 20

Speed of a wave

Answer 20

Wavelength (m) x frequency (/s)

Question 21

Refractive index

Answer 21

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

Question 22

Charge

Answer 22

It

Question 23

V=

Answer 23

Ir

Question 24

Power

Answer 24

Iv

Question 25

Energy

Answer 25

Ivt= qv= charge x pd

Question 26

Series voltage

Answer 26

Vtot=v1+v2

Question 27

Current in series

Answer 27

Itot= I1=I2

Question 28

Resistance in series

Answer 28

Rtot=R1+R2

Question 29

Voltage in parallel

Answer 29

Vtot=V1+V2

Question 30

Current in parallel

Answer 30

Itot=I1+I2

Question 31

Resistance in parallel

Answer 31

1/Rtot=1/R1 +1/R2

Question 32

Resistive heating

Answer 32

P=I^2 X R

Question 33

Power in transformers

Answer 33

Pp=Ps

IpVp=IsVs

Question 34

Number of turns in coil - transformers

Answer 34

Np/Ns=Vp/Vs

Question 35

Right thumb rule

Answer 35

Thumb=direction of current

Curled hand=magnetic field (in concentric circles)

Question 36

Left hand rule

Answer 36

Motor :
thumb= force (movement)
1st finger= field direction
2nd finger= current direction

Question 37

Right hand rule

Answer 37

Generator:
Thumb= motion
1st finger= field direction
2nd finger= current direction

Question 38

1 watt

Answer 38

1 joule

Question 39

1Nm

Answer 39

1 joule

Question 40

1 joule

Answer 40

1 watt/Nm

Question 41

Voltage in potential divider circuit

Answer 41

Vout=Vin x (R/Rtot)