Stretching and Squashing

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Hookes Law The following topics will be discussed in this presentation: 1. Hookes law 2. Elastic behaviour of materials by stretching a spring and producing.

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Presentation transcript:

Stretching and Squashing 05 December 2018 Objective: To examine the behaviour of materials when forces act on them.

Starter (5 mins) Carefully demonstrate the loading of an elastic band (eye protection for everybody and cushioned floor) getting the students to describe what is happening in terms of forces and equilibrium. Continue until the band snaps or reaches the floor.

Main For the majority of the lesson the students work in small groups to carry out the activity described in the Student’s Book section: P2.11 ‘What happens when forces stretch a spring?’ on page 238.

Prediction You are about to carry out a practical where you will add masses to an elastic band and measure how much it has stretched. Write a prediction for what you think will happen.

Practical See possible practical sheet

Mass / kg Force / N Length / cm Extension / cm 0.1 1 0.2 2

Graph Plot a graph of your results

Graph Extension of elastic band (cm) Force added to elastic band (N)

Trend What is the trend shown by the graph? When you increase the force added ......... Will this always be the case?

Plenary – 5 mins Structured questions