Figure shows the force- extension graph for a wire that is stretched and then released. Force-extension graph for a wire. (a) Which point shows the limit of proportionality?

Proportionality limit is point on graph upto which the graph is a straight line (Hooke's law is followed) and force is directly proportional to extension. Therefore, point B shows limit of proportionality.

Figure shows the force- extension graph for a wire that is stretched and then released. Force-extension graph for a wire. (b) Which point shows the elastic limit ?

Elastic point is a point on force-extension graph from which stretched material can regain its original length. It lies beyond proportionality limit. Therefore in given graph point C is elastic limit.

Figure shows the force- extension graphs for four springs, A, B, C and D. Force-extension graphs for four different springs. (a) State which spring has the greatest value of force constant.

F = - k x where F is force , k is force constant and x is extension or compression. Since spring D undergoes the least extension therefore, it has the greatest value of force constant.

Figure shows the force- extension graphs for four springs, A, B, C and D. Force-extension graphs for four different springs. (b) State which is the least stiff.

According to Hooke's law F = - k x where F is force , k is force (spring) constant and x is extension or compression. Also, that spring A has the greatest extension therefore, spring A is least stiff.

Figure shows the force- extension graphs for four springs, A, B, C and D. Force-extension graphs for four different springs. (c) State which of the four springs does not obey Hooke's law.

∵ F = - k x Therefore, force extension graph of spring which obey Hooke's law must be a straight line. So we can conclude from the graph that spring A and C do not obey Hooke's law for given range of force.

E M B I B E

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 7 - Matter and Materials>Question

David Sang and Graham Jones Solutions for Chapter: Matter and Materials, Exercise 7: Question

Author:David Sang & Graham Jones

David Sang Physics Solutions for Exercise - David Sang and Graham Jones Solutions for Chapter: Matter and Materials, Exercise 7: Question

Attempt the practice questions on Chapter 7: Matter and Materials, Exercise 7: Question with hints and solutions to strengthen your understanding. Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access solutions are prepared by Experienced Embibe Experts.