A Level Edexcel Physics Paper 1

Newton's Third Law - 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 - 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 - answer-- Two Different Forces - Act on the same line - Same magnitude - Different objects - same time Potential Dividers - answer-A circuit that is used to only output part of the voltage provided Potential Divider equation - answer-Vout/Vin = R1/R1+R2 Potential Dividers and thermistors - 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 - 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 - answer-a resistor whose resistance depends on the temperature of the thermistor As temperature decreases resistance increases LDR - answer-Light dependent resistor As light increases resistance decreases Rheostat - answer-When a variable resistor is used to control current Variable Resistor - answer-A resistor whose value can be varied between its minimum