Formulas

Question 1

Kinetic Energy

Answer 1

KE = 1/2(m)(v sq)

SI Unit - Joules ( J )

Question 2

Gravitational Potential Energy

Answer 2

GPE = MGH

G = 10
SI Unit - Joules( J )

Question 3

Work Done

Answer 3

WD = Force * Distance

Distance - distance moved in direction of force
SI Unit - Joules ( J )

Question 4

Power (energy)

Answer 4

P = E/t = WD/t

SI Unit - Watt

Question 5

Speed

Answer 5

Distance/Time

SI Unit - m/s

Question 6

Weight

Answer 6

W = MG

M - Mass
G - Gravitational Field Strength
SI Unit - Newtons

Question 7

Pressure

Answer 7

P = F/A

F - Force : A = Contact Area : SI Unit - Pascal (Pa) / N/m2

Question 8

Density

Answer 8

ρ = m/v

M - Mass : V - Volume : SI Unit - kg/m3

Question 9

Resultant Force

Answer 9

F = MA

M - Mass : A - Acceleration

Question 10

Moment of Force

Answer 10

M = Fd

F - Force Applied : d - Perpendicular Distance

Question 11

Frequency of Wave

Answer 11

F = 1/t

t - Period of Wave

Question 12

Velocity of wave

Answer 12

V = fλ & V = λ/t

f - frequency : λ = wavelength

V = λ/t is derived from subsituting f for 1/t

Question 13

Refractive index of medium

Answer 13

n = c/v
n = sin i/sin r

c - 3x10^8 : v - speed of light in medium

snell’s law can also be applied

Question 14

Current/Charge

Answer 14

I = Q/t

I - Current : Q - Charge : t - time taken

Question 15

Electromotive force

Answer 15

E = W/Q

W - Work done (J) : Q - Amount of Charge (C) : SI unit (V)

Question 16

Potential difference

Answer 16

E = W/Q

W - Work done (J) : Q - Amount of Charge (C) : SI unit (V)

Question 17

Resistance of component

Answer 17

R = V/I & R = k*l/a

V - voltage : I - Current

Question 18

Resistance in series

Answer 18

Re = R1 + R2 + R3…

SI Unit - Ohm (Ω)

Question 19

Resistance in parallel

Answer 19

Re = (1/R1 + 1/R2 +1/R3…)^-1

SI Unit - Ohm (Ω)

Question 20

Power in Practical Electricity

Answer 20

P = VI

Equations can be formed by substituting V and I with V = IR

Question 21

Work Done (Electricity)

Answer 21

Power * time

SI unit - Watt Seconds, practically KWh is used