EQUATIONS TO KNOW FOR DECEMBER MOCKS:

Question 1

P1,2,3:

Kinetic energy equation:

Answer 1

Ek = 1/2 x m x v^2

Ek = J, M = kg, V = m/s

Question 2

P1,2,3:

Gravitational Potential Energy Equation:

Answer 2

Ep = m x g x h

Ep = J, M = kg, g = N/kg, h = m

Question 3

P1,2,3:

Elastic Potential Energy Equation:

Answer 3

Ee = 1/2 x k x e^2

Ee = J, K = N, E = m

Question 4

P1,2,3:

Change in Thermal Energy Equation:

Answer 4

ΔE = Change in Thermal Energy = Mass x Specific Heat Capacity x Change in Temperature (m x c x ΔΘ)

E = j, M = kg, C = J/kg°C, Θ = °C

Question 5

P1,2,3:

Power equations:

Answer 5

Power = energy transferred/time (P=E/T)

                       OR

Power = work done/time (P=W/T)

P = W, E = J, W = J, T = s

Question 6

P1,2,3:

Efficiency equations:

Answer 6

Efficiency = useful output energy transfer (J/kJ) / total input energy transfer (J/kJ)

                      OR

Efficiency = useful power output (W/kW) / total power input (W/kW)

Question 7

P6:

Density equation:

Answer 7

Density = Mass/Volume (p = m/v)

P = kg/m^3, M = kg, V = m^3

Question 8

P6:

Specific Latent Heat Equation:

Answer 8

Energy = Mass x Specific Latent Heat (E=mL)

Question 9

P6:

Pressure in gases equation:

Answer 9

Pressure x Volume = Constant (P x V = constant)

P = Pa, V = m^3

Question 10

P8,9,10,11:

Forces equation:

Answer 10

Force = Mass x Acceleration (F = MA)

F = N, M = kg, A = m/s^2

Question 11

P8,9,10,11:

Weight equation:

Answer 11

Weight = Mass x Gravitational Field Strength (W = M x G)

W = kg, M = kg, G = N/kg

Question 12

P8,9,10,11:

Work done (energy transferred) equation:

Answer 12

Work Done (energy transferred) = Force x Distance Moved (W = FD)

W = j, F = N, D = m

Question 13

P8,9,10,11:

Force applied equation:

Answer 13

Force Applied = Spring Constant x Extension (F = K x E)

F= N, K = N/m, E = m

Question 14

P8,9,10,11:

How to calculate spring extension:

Answer 14

Spring Length - Original Length

Question 15

P8,9,10,11:

Moments equation:

Answer 15

Moment = Force x Distance (M = F x D)

M = Nm, F = N, D = m

Question 16

P8,9,10,11:

How to balance moments equation:

Answer 16

Total Anticlockwise Moments = Total Clockwise Moments

Question 17

P8,9,10,11:

Pressure equation:

Answer 17

Pressure = Force/Area (P = F/A)

P = Pa, F = N, A = m^2

Question 18

P8,9,10,11:

Pressure in FLUIDS equation:

Answer 18

Pressure = Height of Column x Density of Liquid x Gravitational Field Strength (P = H x D x G)

P = Pa, H = m, D = kg/m^3, G = N/kg

Question 19

P8,9,10,11:

Speed equation:

Answer 19

Speed = Distance / Time (S = D/T)

S = m/s, D = m, T = s

Question 20

P8,9,10,11:

Accelaration equation:

Answer 20

Acceleration = Change in Velocity / Time Taken ( A = ΔV/T)

A = m/s^2, ΔV = m/s, T = s

Question 21

P8,9,10,11:

Changes in velocity (due to acceleration) equation:

Answer 21

Final Velocity^2 - Initial Velocity^2 = 2 x Acceleration x Displacement (v^2 - u^2 = 2as)

V = m/s, U = m/s, a = m/s^2, d = m

Question 22

P8,9,10,11:

Resultant Force (Newton’s 2nd Law) equation:

Answer 22

Resultant Force = Mass x Acceleration (R = M x A)

R = N, M = kg, A = m/s^2

Question 23

P8,9,10,11:

Momentum equation:

Answer 23

Momentum = Mass x Velocity (P = MV)

P = N, M = kg, V = m/s

Question 24

P8,9,10,11:

Changes in Momentum equation:

Answer 24

Force = Change in Momentum / Time Taken (F = mΔv/Δt)

F = N, mΔv = kg m/s, Δt = s

Question 25

P12,13,14:

Time period equation:

Answer 25

Time Period = 1 / Frequency (t = 1/f)

t = s, f = Hz

Question 26

P12,13,14:

Wave speed equation:

Answer 26

Wave Speed = Frequency x Wavelength (v = f x λ)

v = m/s, f = Hz, λ = m

Question 27

P12,13,14:

Law of reflection equation:

Answer 27

Angle of Incidence = Angle of Reflection ( i = r)

Question 28

P12,13,14:

Magnification equation:

Answer 28

Magnification = Image Height (nm) / Object Height (nm)

Question 29

P12,13,14:

Lens power equation:

Answer 29

Power = 1 / focal length (p = 1/f)

p = d, f = m

Question 30

P12,13,14:

Lens equation:

Answer 30

1/Focal Length = 1/Distance Between Lens and Object + 1/Distance Between Lens and Image (1/f = 1/u + 1/v)