A level physics Review Revision

Define pressure - ANSWERSThe force per unit area Define moment of a force - ANSWERSForce multiplied by the perpendicular distance from the pivot to the line of action of the force Define density - ANSWERSThe mass per unit volume Define 1 newton - ANSWERSThe force requires to love an object of 1 kg with an acceleration of 1 m/s2 For any object to be in equilibrium.. - ANSWERSThe sum of the clockwise moment has to be equal to the sum of the anti clockwise moment about the pivot NetTorque and NetForce is always 0 in.. - ANSWERSEquilibrium Define torque - ANSWERSOne of the forces X by the perpendicular distance between the forces Define couple - ANSWERSPairs of equal and opposite forces that produce rotation, eg steering wheel Reaction time is .. - ANSWERSThe time taken for driver to react to a stimulant 1000L is how many m3? - ANSWERS1m3 Accurate is.. - ANSWERSHow far is your value from the real value Precise is.. - ANSWERSHow many times you repeat your experiment and get the same value SUVAT equations only work when.. - ANSWERSAcceleration is constant Tensile stress - ANSWERSThe force applied per unit area of the wire Tensile strain - ANSWERSThe fractional change in the original length of the wire Ultimate tensile strength - ANSWERSThe maximum stress that a material can withstand when being stretched Brittle - ANSWERSWhen materials cannot be permanently stretched, they break after the elastic limit has been exceeded Ductile - ANSWERSMaterial cannot return to its original shape Equation for tstress - ANSWERSF/A Equation for tsrain - ANSWERSX/l Equation for young modulus - ANSWERSTstress/tstrain Archimedes principle - ANSWERSUpthrust on an object in a fluid is equal to the weight of the fluid displaced Hookes law - ANSWERSThe force applied to an extensible material is directly proportional to its extension Define work done by a force - ANSWERSForce X distance moved in direction of force Define power - ANSWERSEnergy/time Why can the efficiency of a mechanical device never be 100%? - ANSWERSThis is because of heat/thermal energy Equation for kinetic energy - ANSWERS1/2mv2 Newtons 1st law - ANSWERSAn object at rest or moving at an constant velocity will continue to do so unless acted on by a resultant force Newtons 2nd law - ANSWERSThe resultant force on an object in a certain direction is directly proportional to the rate of change of momentum of that object in the same direction Newtons 3rd law - ANSWERSEvery force has an equal & opposite reaction force Transverse - ANSWERSDisplacement of particles are perpendicular to direction of the wave Longitudinal - ANSWERSDisplacement of particles are parallel to direction of the wave Examples of transverse waves - ANSWERSS waves and electromagnetic Examples of longitudinal waves - ANSWERSP waves and sound Wavelength - ANSWERSThe distance between a point on one wave to the same point on the next wave Amplitude - ANSWERSThe maximum displacement from rest position Time period - ANSWERSTime taken for a wave length to complete a full cycle Frequency - ANSWERSThe number of waves that pass a given point per second Equation for F - ANSWERS1/T Name of symbol for wavelength - ANSWERSLambda Phase difference - ANSWERSIs the amount by which 2 points on a wave of wavelength separated by a distance x Reflection - ANSWERSOccurs when waves change direction when they meet an impenetrable barrier and bounce off it Refraction - ANSWERSIt happens when light enters a different median and changes directiob Diffraction - ANSWERSIs the spreading of a wave as it passes through a gap or around an edge Constructive - ANSWERSWhen waves are in phase and the amplitude of them add up Destructive - ANSWERSWhen the waves are in anti phase and the amplitude cancel out Path difference for constructive - ANSWERSN X lambda Path difference for destructive - ANSWERSN X 1/2 X lambda