EQUATIONS TO KNOW FOR DECEMBER MOCKS: Flashcards
P1,2,3:
Kinetic energy equation:
Ek = 1/2 x m x v^2
Ek = J, M = kg, V = m/s
P1,2,3:
Gravitational Potential Energy Equation:
Ep = m x g x h
Ep = J, M = kg, g = N/kg, h = m
P1,2,3:
Elastic Potential Energy Equation:
Ee = 1/2 x k x e^2
Ee = J, K = N, E = m
P1,2,3:
Change in Thermal Energy Equation:
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
P1,2,3:
Power equations:
Power = energy transferred/time (P=E/T)
OR
Power = work done/time (P=W/T)
P = W, E = J, W = J, T = s
P1,2,3:
Efficiency equations:
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)
P6:
Density equation:
Density = Mass/Volume (p = m/v)
P = kg/m^3, M = kg, V = m^3
P6:
Specific Latent Heat Equation:
Energy = Mass x Specific Latent Heat (E=mL)
P6:
Pressure in gases equation:
Pressure x Volume = Constant (P x V = constant)
P = Pa, V = m^3
P8,9,10,11:
Forces equation:
Force = Mass x Acceleration (F = MA)
F = N, M = kg, A = m/s^2
P8,9,10,11:
Weight equation:
Weight = Mass x Gravitational Field Strength (W = M x G)
W = kg, M = kg, G = N/kg
P8,9,10,11:
Work done (energy transferred) equation:
Work Done (energy transferred) = Force x Distance Moved (W = FD)
W = j, F = N, D = m
P8,9,10,11:
Force applied equation:
Force Applied = Spring Constant x Extension (F = K x E)
F= N, K = N/m, E = m
P8,9,10,11:
How to calculate spring extension:
Spring Length - Original Length
P8,9,10,11:
Moments equation:
Moment = Force x Distance (M = F x D)
M = Nm, F = N, D = m
P8,9,10,11:
How to balance moments equation:
Total Anticlockwise Moments = Total Clockwise Moments
P8,9,10,11:
Pressure equation:
Pressure = Force/Area (P = F/A)
P = Pa, F = N, A = m^2
P8,9,10,11:
Pressure in FLUIDS equation:
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
P8,9,10,11:
Speed equation:
Speed = Distance / Time (S = D/T)
S = m/s, D = m, T = s
P8,9,10,11:
Accelaration equation:
Acceleration = Change in Velocity / Time Taken ( A = ΔV/T)
A = m/s^2, ΔV = m/s, T = s
P8,9,10,11:
Changes in velocity (due to acceleration) equation:
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
P8,9,10,11:
Resultant Force (Newton’s 2nd Law) equation:
Resultant Force = Mass x Acceleration (R = M x A)
R = N, M = kg, A = m/s^2
P8,9,10,11:
Momentum equation:
Momentum = Mass x Velocity (P = MV)
P = N, M = kg, V = m/s
P8,9,10,11:
Changes in Momentum equation:
Force = Change in Momentum / Time Taken (F = mΔv/Δt)
F = N, mΔv = kg m/s, Δt = s
P12,13,14:
Time period equation:
Time Period = 1 / Frequency (t = 1/f)
t = s, f = Hz
P12,13,14:
Wave speed equation:
Wave Speed = Frequency x Wavelength (v = f x λ)
v = m/s, f = Hz, λ = m
P12,13,14:
Law of reflection equation:
Angle of Incidence = Angle of Reflection ( i = r)
P12,13,14:
Magnification equation:
Magnification = Image Height (nm) / Object Height (nm)
P12,13,14:
Lens power equation:
Power = 1 / focal length (p = 1/f)
p = d, f = m
P12,13,14:
Lens equation:
1/Focal Length = 1/Distance Between Lens and Object + 1/Distance Between Lens and Image (1/f = 1/u + 1/v)
