Speed = distance per unit time In m/s

Velocity = Displacement per unit time Displacement (s) is Final distance - Initial distance

A = ∆V/T [Change in velocity per unit time]

2As = U^2 - V^2 [s is the distance]

Density = Mass per volume In Kg/cm^3

Density is proportional to Mass Density is inversely-proportional to Volume Density is inversely-proportional to Temperature

Force = Mass by acceleration in Newtons (N)

Momentum = Mass by velocity in Newtons-seconds (Ns) or (Kgm/s)

Force = Change in momentum per unit time In Newtons (N)

Impulse = Force by time in Newtons-seconds (Ns) or (Kgm/s)

Impulse is the change in momentum

M1V1 + M2V2 = M1U1 + M2U2 Initial momentum + Final momentum = Initial momentum + Final momentum

Force = Spring constant by length of the extension in Newtons (N)

Force is proportional to the extension

p = F/a [Pressure is Force per unit area]

In liquids: L = Pgh [Density by gravity (9.8N/kg) by Depth in length]

Pressure is proportional to Depth (m) Pressure is proportioanl to Density (P)

Pressure is in Pascals (Pa) or Newton per meter squared (N/m^2)

EXTRA: Volume is inversely proportional to pressure But it is proportional to 1/V (1 over volume)

Moment = Force by distance In Newton-meter (Nm)

Clockwise = Anticlockwise

Distance is inversely proportional to Force

Kinetic Energy (Ke) = 1/2 mv^2 [Half of mass by velocity squared]

Gravitational Potential Energy (gpe) = mgh [mass by gravity by height]

Mass is proportional to gpe Velocity is proportional to Ke

Weight = mass by gravity In Newtons (N)

Work [Energy] (E) = Fd [Force by distance] Measured in Joules (J)

Power (P) = E/t [Energy per time] Measured in Watts (W)

Efficiency = Useful Output/Total Input x 100 [Useful input per total input] Measured as a percentage (%)

P1V1 = P2V2 Initial pressure by volume should be = Final pressure by volume

Specific Heat Capacity: Energy (E) = mC∆T [Mass by SHC (C) by change in temperature Measured in Joules (J)

Power {W} by time {s} (PT) [To find Energy] = mC∆T

Energy also = VIt [Voltage (V) {in voltage V} by Current (I) {amps A} by time (t) {in seconds s} So VIT also = mC∆T

V = A'/t [Speed of a wave is the wavelength in length (m) per unit time in seconds (s)]

2nd variation of speed: V = fA' [Speed is frequency in Hertz (Hz) by Wavelength in length (m)]

Refractive index (n) = Sin(i[air])/Sin(r[medium])

Critical angle formula = Sin^-1 (1/n) To find n from Critical angle: n = 1/Sin(C) [Sin(C) is the critical angle]

Voltage (V) = E/Q [E is Energy (J) and Q is Charge (C-Coulombs)] Voltage is energy per unit charge in Volts (V)

Also called as P.D (Potential difference) or EMF (Electromotive Force)

P.D travels through electrica components (conducted) EMF travels across the battery or cell (to power the charge through the circuit)

Voltage is directly proportional to Current (No OHM's Law) Voltage is directly proportional to Resistance (OHM's Law)

Voltmeter is Used to measure voltage in a circuit

Current (I) = Q/t [Q is the Charge (C-Coulombs) and t is time in seconds (s)] Current is Charge per unit time in Amps (A)

Current is directly proportional to Voltage (No OHM's Law) Current is inversely-proportional to Resistance (OHM's Law)

Ammeter is used to measure Current in a circuit

Formula: V = IR [Voltage = Current (I)-(In Amps A) by Resistance (R)-(In OHM's Ω)

Voltage is proportional to resistance Current is inversely-proportional to resistance

Resistor is used to give resistance to a circuit

Resistance is proportional to a length of a wire Resistance is inversely proportional to a thickness/diameter of a wire

Thermistor: Temperature is inversely proportional to Resistance

LDR: Light is inversely proportional to Resistance

Power (P) = VI [Voltage (V) by current (I) in Watts (W)-(Which is power P)

Eneregy (E) = Pt [Power (P)-(In Watts W) by time (t)-(In seconds s)

Combined formulas: Power (P) = I^2R [Current (I^2) squared by resistance(R)] Power (P) = V^2/R [Voltage squared (V^2) per Resistance (R)]

In Series: R1 + R2 + R3...

In Parallel (Multiple Resistors): 1/R1 + 1/R2 + 1/R3...

In Parallel (Two Resistors): Product/Sum [R1xR2/R1+R2]

Primary Voltage (Vp) / Secondary Voltage (Vs) = Primary n.o Turns (Np) / Secondary n.o Turns (Ns)

Rate (R) = mass per unit time Measured in Kg/s