Physics P2 2.6 Stretching and squashing. 0.0 / 5 ? PhysicsForces and MotionGCSEAQA Created by: Atlanta and JacobCreated on: 29-09-16 19:26 What will happen if we hang small weights from a spring? It will stretch. 1 of 24 What is the increase in length from the original spring to the spring once stretched called? The extension. 2 of 24 What happens when weights are removed from a spring? It returns to its original length. 3 of 24 What are objects and materials that stretch and then return to their original length called? Elastic. 4 of 24 What is an elastic object? Something that regains its original shape when the forces deforming it are removed. 5 of 24 What would we get if we plot a graph of extension against force applied for a spring? A straight line that passes through the origin. 6 of 24 What does the straight line that passes through the origin on a graph of extension against force applied for a spring tell us? That the extension is directly proportional to the force applied. 7 of 24 What would happen on the chart if we apply too big a force? The line begins to curve because we have exceeded the limit of proportionality. 8 of 24 What is the law that elastic objects and materials are said to obey? Hooke's law. 9 of 24 What does Hooke's law state? That the extension is directly proportional to the force applied, provided the limit of proportionality is not exceeded. 10 of 24 What is the equation we can write for Hooke's law? F = k x e. 11 of 24 In the equation for Hooke's law, what is F? The force in newtons (N). 12 of 24 In the equation for Hook's law, what is k? The spring constant of the spring in newtons per metre (N/m). 13 of 24 In the equation for Hooke's law, what is e? The extension in metres (m). 14 of 24 The stiffer a spring is....? The greater its spring constant. 15 of 24 When an elastic object is stretched, work is done, how is this energy stored? As elastic potential energy in the object. 16 of 24 What happens when the stretching force is removed? The stored energy is released. 17 of 24 What is the extension? The difference between the length of the spring and its original length. 18 of 24 What is the extension of a spring directly proportional to? The force applied to it, provided the limit of proportionality is not exceeded. 19 of 24 What is the spring constant of a spring? The force per unit extension needed to stretch it. 20 of 24 What is an inelastic object? An inelastic object is one that does not regain its original shape when the forces deforming it are removed. 21 of 24 A spring has a spring constant of 30 N/m. If the extension is 0.30m, what is the force applied? 9N. 22 of 24 How can we tell when a spring has exceeded its limit of proportionality? The graph of extension against force applied is no longer a straight line. 23 of 24 **TWO QUANTITIES ARE DIRECTLY PROPORTIONAL TO EACH OTHER ONLY IF PLOTTING THEM ON A GRAPH GIVES A STRAIGHT LINE THROUGH THE ORIGIN** **LOOK UP GRAPHS OF EXTENSION VERSUS FORCE APPLIED FOR DIFFERENT MATERIALS** 24 of 24

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