Physics Unit 2 Revision (Higher tier)

Extension (m)(iii)Calculate the constant speed reached by the ball-bearing.Show clearly how you use the graph to work out your answer..................................................................................................................................................................................................................................................................................................................................................................................Hooke’s LawSpeed = ............................................................ m/s(2)(Total 7 marks)When a weight (force) is applied to a spring it extends. The amount it extendsis proportional to the force added. It is governed by the equation:Force (N) = spring constant (N/m) x extension (m)F(F = k x e )keThe spring constant can be determined from the gradient (slope of the line) ona force extension graph.Force extension graph for a spring765432100 2 4 6 8 10 12 14Force (N)Limit ofproportionalityChoose a section of the line and measure the amount of force and theextension. Then divide the force by the extension