AQA A Level Physics Materials Exam Questions with Complete Solutions
Density - ANSWER-mass per unit volume Density is a SCALAR quantity Units of density - ANSWER-kg m-3 Hooke's Law - ANSWER-extension is proportional to the force applied, up to the limit of proportionality. Features of graph of force against extension confirming Hooke's Law - ANSWER-straight line, through the origin. Units of spring constant - ANSWER-Nm-1 Springs in series - ANSWER-• Both springs experience the same force F. • The total extension (of both springs together) is the sum of the extension of each spring individually. (Identical) Springs in parallel - ANSWER-• The force F applied to the spring combination is shared across each of the springs individually (if there are two identical springs, each spring experiences a force of ½F). • All springs have the same extension (and equals the extension for the spring combination). Elastic limit - ANSWER-the maximum amount a material can be stretched by a force and still return to its original length when the force is removed. Limit of proportionality - ANSWER-point beyond which force is no longer proportional to extension
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