OCR Gateway Physics; Equations
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33 Terms
Density
mass / volume
Specific Heat Capacity ( J / Kg °C )
change in thermal energy (Joules) = mass (Kg) x Specific Heat capacity x change in temperature ( °C )
Specific Latent Heat
Energy required or release ( J ) = Mass ( Kg ) x Specific Latent Heat ( j / Kg )
Pressure
Pressure ( Pa ) = Force ( n ) / Area ( m² )
Pressure due to a column of liquid
height of column x density of liquid x gravitational field strength (10N/Kg)
Speed
distance / time
Acceleration
change in velocity / time
Calculating Distance or Velocity for Uniform Acceleration
(final velocity)^2 - (initial velocity)^2 = 2 x acceleration x distance
Force
mass x acceleration
Momentum
mass x velocity
Force
change in momentum / time
Gravity Force
mass x gravitational field strength
Potential Energy
mass x height x gravitational field strength
Kinetic Energy
0.5 x mass x (speed)^2
Work Done
force x distance
Power
work done / time
Hooke's Law
force exerted by a spring = extension x spring constant
Energy Transferred in Stretching
0.5 x spring constant x (extension)^2
Moment of a Force
force x distance
Principle of Moments
total anticlockwise moments = total clockwise moments
Levers, Force Multipliers
input force / output force = distance of output force from pivot / distance of input force from pivot
Pressure
force normal to a surface / area of that surface
Charge
current x time
Potential Difference
energy transferred / charge
Potential Difference
current x resistance
Energy Transferred
power x time
Power
potential difference x current
Power
(current)^2 x resistance
Force on a Conductor Carrying a Current
magnetic flux density x current x length
Transformer Equation
potential difference across primary coil / potential difference across secondary coil = number of turns in primary coil / number of turns in secondary coil
Wave Speed
frequency x wavelength
Reflected Waves
angle of incidence = angle of reflection
Efficiency
useful output energy transfer / input energy transfer
Note 
Flashcards (86)