# Top 20 Important Physics Formulas for 10th Class CBSE

Contents

## 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)

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