26 Feb 2013 Starter - Rub 1.Rub your hands together. 2.What happens? Why? 3.Why is there so much friction on our hands?

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Presentation transcript:

26 Feb 2013 Starter - Rub 1.Rub your hands together. 2.What happens? Why? 3.Why is there so much friction on our hands?

Lesson 44 - The Work of Friction Learning Objectives 1. Recognise the force of friction and what causes it. 2. Describe how to reduce unwanted friction. 3. Explain when friction can be useful. 26 Feb 2013

Main - Useful and Non-Useful Friction 1. When is friction produced? 2. Can you think of examples of useful and non-useful friction. Make a table to show your ideas. 26 Feb 2013 Useful FrictionNon-Useful Friction

Investigation Reducing Friction 1. You are going to investigate how well different lubricants work. 2. Prediction - Which lubricant do you think will reduced friction the most. Explain why? 3. Results - Make a table. 26 Feb 2013 Lubricant UsedFriction on Block/NFriction on block lubricant/NDifference/N Vegetable oil Washing up liquid Water Soap

Investigation Reducing Friction 1. Conclusion - Do your results match your prediction? What do your results show? Explain your results (Why do some lubricants work better than others? Example My results show This is because Feb 2013