Elastic Potential Energy Complete Lesson, with scaffolded worksheets and answers NEW GCSE (1-9)

I have created and used this lesson for my year 11s and year 9s when teaching elastic potential energy as part of the new GCSE specification.
It includes a complete PowerPoint with some of the calculation examples when using Ee = 0.5 x spring constant x extension2. It also includes answers with a complete explanation for each.
Then there is a sequence of worksheets to use that could be offered either as extension work or additional homework practice.

How to use them:
Print the pdfs. Because publisher often changes format when you open these files on different when opened on different PCs, it is easiest to open and print the worksheets from the pdf versions. You should then also be able to print them A5 size, 2 per sheet and back to back to minimise printing costs, or A4 stapled if you have the budget.

Why the worksheets are designed this way? – The evidence base
With the worksheets I have incorporated scaffolding based on cognitive load theory including lots of worked examples problem pairs, faded examples then multiple-choice questions to foster student self-explanation. There is a large body of research that has shown faded examples and worked example problem pairs are much more effective for student learning than standard problem solving. The self-explanation multi-choice questions are based on further research that has found that this helps middle and lower ability students to understand why they carry out certain procedures. These types of questions have also been found to be useful at helping students apply what they have learnt to novel problems.

See:

Renkl, A. Atkinson, R. Merrill, M. (2003); Transitioning From Studying Examples to Solving Problems: Effects of Self-Explanation Prompts and Fading Worked-Out Steps; Journal of Educational Psychology
http://mrbartonmaths.com/resourcesnew/8. Research/Making the most of examples/Fading out and Prompts.pdf
Transitioning From Studying Examples to Solving Problems: Effects of Self-Explanation Prompts and Fading Worked-Out Steps
Author(s): Robert K. Atkinson, Alexander Renkl and Mary Margaret Merrill

Please if you get chance can you review this and let me know any feedback too. Thanks

Updates: WS1 v6 has been uploaded to included a small correction on q16 diagram