(gentle upbeat music) <v ->In this year-five lesson from the unit,</v> Forces: Including Simple Machines, pupils further their substantive knowledge of forces, specifically learning that friction is a force that acts between surfaces and that different surfaces create varying amounts of friction. Prior to this, pupils planned an investigation to measure the effects of friction, and learned how a force metre can measure the force needed to move an object across different surfaces. In this lesson, the teacher guides the pupils as they compare the frictional force required to pull a weighted shoe across different surfaces and create a bar chart to present their collected data. <v ->So, do different surfaces create</v> different amounts of friction? And we need to try and answer that question. So I'm gonna put this one kilogramme mass inside of the shoe. (gentle upbeat music) <v ->This video shows pupils as active participants,</v> working scientifically and purposefully to write a conclusion that helps make sense of their findings and answers the inquiry question, do different surfaces create different amounts of friction? In doing so, they develop their disciplinary knowledge of how to report and present findings from inquiries, including drawing conclusions. <v ->We need to try and write something</v> that answers that question. I know this because, all right? So I just want you to use your whiteboard, all right, to jot down some ideas that you have. <v ->Now that pupils have summarised their findings</v> by writing a conclusion, they should compare their conclusions with others in the class to ensure they have addressed the original inquiry question and explain the results in relation to their understanding of frictional forces. <v ->Different surfaces create different amounts of friction. </v> The grass surface has the most friction. I think this is because the grass is not smooth. Lino and wood had the least friction. I think this is because they are very smooth surfaces and they don't need a lot of pulling force in Newton's to make the shoe move. (gentle upbeat music) <v ->The grass made the most friction. </v> I know this because it needed the most force. The grass is rough and it needed the most force. Rough surfaces cause the most friction. (gentle upbeat music) <v ->Pupils should also be encouraged to use their test results</v> and conclusions to make predictions for further comparative and fair tests. (gentle upbeat music).