Physic Formula

• kinetic energy = 0.5 × mass × (speed)2
• elastic potential energy = 0.5 × spring constant × (extension)2
• gravitational potential energy = mass × gravitational field strength × height
• change in thermal energy = mass × specific heat capacity × temperature change
• power = energy transferred / time
• power = work done / time
• efficiency = useful output energy transfer / total input energy transfer
• efficiency = useful power output / total power input
• charge flow = current × time
• potential difference = current × resistance
• power = potential difference × current
• power = (current)2 × resistance
• energy transferred = power × time
• energy transferred = charge flow × potential difference
• potential difference across primary coil × current in primary coil = potential difference across secondary coil × current in secondary coil
• density = mass / volume
• thermal energy for a change of state = mass × specific latent heat
• weight = mass × gravitational field strength
• work done = force × distance (along the line of action of the force)
• force = spring constant × extension
• distance travelled = speed × time
• acceleration = change in velocity / time taken
• (final velocity)2 – (initial velocity)2 = 2 × acceleration × distance
• resultant force = mass × acceleration
• momentum = mass × velocity
• period = 1 / frequency
• wave speed = frequency × wavelength
• force on a conductor (at right angles to a magnetic field) carrying a current = magnetic flux density × current × length