# IGCSE Physics formulas

### Description

Physics formulas on grade 10 level in preparation for IGCSEs. (Some terms included)
Flashcards by Imani :D, updated more than 1 year ago
 Created by Imani :D over 8 years ago
288
37

## Resource summary

 Question Answer density mass / volume average speed distance moved / time taken What is velocity? the speed of something and its direction (vector) average acceleration change in velocity / time taken resultant force (force) mass X acceleration weight mass X g What is g in terms of Newtons g = 10N/kg What is Newtons third law of motion If object A exerts a force on object B, then object B will exert an equal but opposite force on object A momentum mass X velocity change in momentum (impulse) resultant force X time load spring constant X extension pressure force / area work done force X distance moved (in the direction of the force) what is work done equal to? energy tranformed gravitational potential energy mgh (weight X g X height) kinetic energy efficiency useful work done (useful energy output) / total energy input power work done / time taken useful power output force X speed How many degrees Celcius is 0 K? -273 degrees What is the wave equation? speed = frequency X wavelength What is the refractive index? refractive index = speed of light in vacuum / speed of light in medium charge current / time potential difference voltage at the beginning of a circuit - voltage at the end of a circuit resistance p.d across conductor (V) / current through conductor (A) What is Ohms law? that current is proportional to the potential difference in a ciruit How does one calculate the combined resistance in series circuits? R = R1+ R2 How does one calculate the combined resistance in parallel circuits? or combined resistance = resistance multiplied / resistance added power energy transformed / time taken or power = p.d X current energy transformed power X time taken or p.d X current X time taken How can the ratio of the voltage and the number of turns on the input and output (primary and secondary) coils be described? output voltage / input voltage = turns on output coil / turns on input coil How can the ratio of power in a transformer be described? (if no energy is lost) input voltage X input current = output voltage X output current or V1 X I1 = V2 X I2

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