## Mechanics:

**Newton’s Second Law of Motion:**F = ma (Force = mass x acceleration)**Weight:**W = mg (Weight = mass x gravity)**Work Done:**W = Fd (Work done = force x distance)**Pressure:**P = F/A (Pressure = force/area)**Uniform Acceleration:**v = u + at (final velocity = initial velocity + acceleration x time)

## Motion:

**Average Speed:**s = d/t (average speed = total distance/total time)**Distance Moved in Uniformly Accelerated Motion:**s = ut + ½ at² (distance moved = initial velocity x time + ½ acceleration x time

## Forces:

**Normal Force:**N = mg cosθ (normal force = weight x cos(angle between surface and normal)**Frictional Force:**f = µN (frictional force = coefficient of friction x normal force)**Centripetal Force:**Fc = mv²/r (centripetal force = mass x velocity²/radius)

## Electricity:

**Ohm’s Law:**V = IR (voltage = current x resistance)**Electrical Power:**P = VI (power = voltage x current)**Series Circuit:**V = V₁ + V₂ + … (total voltage in series circuit is the sum of individual voltages)**Parallel Circuit:**I = I₁ + I₂ + … (total current in parallel circuit is the sum of individual currents)

## Light:

**Reflection of Light:**i = r (angle of incidence is equal to angle of reflection)**Refraction of Light:**sin(i)/sin(r) = n (ratio of sine of angle of incidence to sine of angle of refraction is equal to refractive index)**Mirror Formula:**1/f = 1/u + 1/v (reciprocal of focal length is equal to the sum of reciprocals of object distance and image distance)

## Sound:

**Speed of Sound in Air:**v = 332 + 0.6t (speed of sound in air at temperature t°C)**Frequency:**f = n/t (frequency = number of vibrations/time

## Energy:

**Potential Energy:**PE = mgh (potential energy = mass x gravity x height)