physic IGCSE
4.0(1)
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46 Terms
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Average velocity (ms-1)
displacement (m)/time (s)
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Period of a pendulum (s)
total time (s)/ number of swings
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Average speed (ms-1)
distance (m)/time (s)
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Acceleration (ms-2)
final velocity (ms -1 ) – initial velocity (ms -1 )/time (s)
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Weight (N)
mass (kg) × gravitational field strength (ms-2)
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Earth’s gravitational field strength
10 ms^-2
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Force (N)
mass (kg) × acceleration (ms^-2)
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Density (kgm-3)
mass (kg)/volume (m3)
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Hooke’s law
Force (N) = constant (Nm-1) × extension (m)
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Pressure (Pa)
force (N)/area (m2)
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Fluid Pressure (Pa)
density (kgm-3) × gravitational field strength (ms^-2 or Nkg^-1) × height (m)
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Work (J)
force (N) × distance moved (m)
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Power (W)
work (J)/ time (s)
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Kinetic Energy (J)
½ × mass (kg) × velocity^2 (ms-1)
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Gravitational potential energy (J)
mass (kg) × gravitational field strength (ms^-2 or Nkg-1) × height (m)
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Efficiency (%)
useful(power/energy) output (W) × 100 /
total (power/energy) input (W)
total (power/energy) input (W)
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Moment (Nm)
force (N) × perpendicular distance from pivot (m)
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Sum of clockwise moments (Nm)
sum of anticlockwise moments (Nm)
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Momentum (kgms-1)
mass (kg) × velocity (ms-1)
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Force (N)
change in momentum (kgms -1 )/ time (s)
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Impulse (kgms-1 or Ns)
change in momentum (kgms-1)
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Centripetal Force (N)
mass (kg) × velocity ^2 (ms -1 )/radius (m)
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Orbital Period (s)
2 × π × radius (m) / velocity (ms-1)
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Boyle’s Law for changes in gas pressure at constant temperature :
pressure1 (Pa) × volume1 (m^3) = pressure2 (Pa)× volume2 (m^3)
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Boyle’s Law for changes in gas pressure at constant temperature2 :
pressure (Pa) × volume (m^3) = constant
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energy required
mass (kg) × specific heat capacity (Jkg^-1°C^-1) × temperature change (°C)
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\
\
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\
\
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\
\
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Current (A)
charge (C)/time (s)
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Voltage (V)
energy transferred (J)/charge (C)
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Voltage (V)
current (A) × resistance (Ω)
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Power (W)
current (A) × voltage (V)
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Power (W)
current^2 (A) × resistance (Ω)
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Energy transferred (J)
current (A) × voltage (V) × time (s)
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Energy transferred (J)
power (W) × time (s)
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Resistors in series:
Total Resistance (Ω)=sum of individual resistors (Ω)
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Resistors in parallel:
1/ total resistance (Ω)= 1/sum of individual resistors (Ω)
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Resistance (Ω)
resistivity (Ωm) × length (m) / area (m2)
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Transformers:
voltage in secondary coil (V) = turns on secondary coil
\-----------------------------------------------------------voltage in primary coil = (V) turns on primary coil
\-----------------------------------------------------------voltage in primary coil = (V) turns on primary coil
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Wave speed (ms^-1)
frequency (Hz) × wavelength (m)
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Frequency (Hz)
1/Period (s)
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Refractive index
sine of the angle of incidence, i /
sine of the angle of refraction, r
sine of the angle of refraction, r
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Refractive index
speed of light in vacuum /speed of light in material
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Refractive index
1 /sine of critical angle
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Energy (J)
mass defect (kg) × speed of light2 (ms^-1)