A Level Edexcel Physics Paper 1 Complete Questions with 100% Correct Answers.

Newton's Third Law Correct Answer If object A exerts a force on object B, then object B exerts an equal but opposite force on object A Newton's Third Law pairs Correct Answer Example: An object exerts a weight of 50N onto the earth. The third law pair would be that the earth would exert a NCF of 50N on the object Conditions for Newton's Third Law Pairs to be true Correct Answer - Two Different Forces - Act on the same line - Same magnitude - Different objects - same time Potential Dividers Correct Answer A circuit that is used to only output part of the voltage provided Potential Divider equation Correct Answer Vout/Vin = R1/R1+R2 Potential Dividers and thermistors Correct Answer If a thermistor is used as R1, as temperature decreases resistance increases and thus Vout increases as they are proportional, this can be used as a heating system to turn it on if it gets cold enough Potential Dividers and LDRs Correct Answer If a LDR is used as R1, as light decreases resistance increases and thus Vout increases as they are proportional, this can be used for street lights to be turned on as light decreases Thermistor Correct Answer a resistor whose resistance depends on the temperature of the thermistor As temperature decreases resistance increases LDR Correct Answer Light dependent resistor As light increases resistance decreases Rheostat Correct Answer When a variable resistor is used to control current Variable Resistor Correct Answer A resistor whose value can be varied between its minimum and maximum values.