I'm teaching this next week (as teaching practice) for the first time, introducing the topic and covering kinematics and energy changes (IB syllabus - no calculus). The students (with their regular teacher) completed 'circular motion' end of last term. I have 3 hours to cover the topics. Are there any particular pitfalls or misconceptions that you think students will be bringing to the party that it would be useful to deal with straight away? I'm planning to find suitable animations and so on to show them and also do pendulum experiment to find g. I was thinking about whether a small circus of simple experiments for them to deduce the acceleration proportional to - displacement relationship is worth doing and if so, any suggestions? Thanks in anticipation!