Paper 1 Physics - Required Practicles

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different materials as thermal insulators can be determined by experiment. Draw a labelled diagram showing how the apparatus used to determine the effectiveness of different materials as thermal insulators should be arranged. ● ● Thermometer ● Lid Small beaker Large beaker 2 Describe how you could use the apparatus you drew to etermine the effectiveness of different materials as thermal insulators. Water Insulation boil water in a kettle and into a beaker wrapped in insulating material use lid to reduce heat lost to surroundings record the temperature of the water using the thermometer every 3 minutes using a stopwatch repeat for different insulating materials draw cooling curves by plotting temperature against time lowest gradient is the best insulator Physics 4.2 Electricity - RPA Resistance The specific heat capacity of copper can be determined by experiment. Draw a labelled diagram showing the circuit used to investigate how the resistance of a wire depends on its length. ● Power supply ● V Resistance wire Ammeter A Voltmeter Describe how you could use the circuit you drew to investigate how the resistance of a wire depends on its length. Ruler measure potential difference and current using the voltmeter and ammeter for different lengths of wire from 10 cm to 90 cm calculate the resistance for each measurement using R = I plot resistance in against length of wire in cm switch off power supply between readings so the wire doesn't get too hot physics 4.2 Electricity - RPA I-V characteristics What happens to the current through a component when the potential difference across it changes? 1 Draw a circuit diagram to investigate the behaviour of a resistor, a lamp and a diode. In each one you are going to measure electric current in the component as you change the potential difference across it. ● ● ● ● Resistor ● +++ 2 Describe how you could use the circuits you drew to investigate the I-V characteristics of a filament lamp, a diode and a resistor at constant temperature. A Lamp |H Currentl X₂ Pd (v) readings repeat this to obtain several pairs of readings repeat for negative values plot a graph of current in A against potential difference in V expected graphs for resistor, lamp and diode: record the readings on the ammeter and voltmeter adjust the variable resistor and record the new ammeter and voltmeter Diode Curront W tr pd (v) Current /CA) 7 0.7 Duck (V) Physics 4.3 Particle Model - RPA Density Density is a characteristic property of a substance. The density of a substance is the relationship between the mass of the substance and how much space it takes up. 1 List/sketch the equipment you could use to determine the density of regular and irregularly shaped objects. ● balance ● ● 2 Describe the methods used to calculate the densities of the regular and irregular shaped objects. ● regular shaped object (i.e. cube): ruler for regular shaped objects displacement can and measuring cylinder for irregular shaped objects ● Displacement can. ● Measuring cylinder ● calculate density using p = irregular shaped object (i.e. small statue): measure mass using a balance immerse in water in displacement can measure mass using a balance measure length, width and height of cube's sides using a ruler calculate volume (m x w x h) m V use measuring cylinder to measure volume of water displaced volume of water displaced = volume of object m calculate density using p = ==