Friction
Often unwanted, Friction works counter to force and acts to reduce the Kinetic energy available to the object, slowing it down. However Friction is also useful and may be used to generate enough thermal energy to form an ember to light a fire. This session will explore firelighting through use of the Bowdrill. This firelighting technique allows us to explore the connection between the force between the two surfaces and the speed of the drill (which is slower than you might think if you have seen it demonstrated on TV). By using different combinations of materials valuable data can be produced that allows for a detailed analysis of the technique and the forces applied.
Challenge
- Are you aware of the link between force, area, pressure and friction?
- Do you understand and are you able to explain Energy Stores?
- Do you want to learn how to light a fire with friction?
- Do you understand the energy transfers that will produce the heat required to form an ember?
Value
This session will draw on parts of the Physics syllabus and will examine:
- the production of thermal energy by friction. We will create a glowing ember using the bow drill and demonstrate how to bring this to flame using a tinder nest.
- We will consider the densities of the materials used,
- the interplay between speed and force to maximise friction.
- For those who are competent there will also be the change to look at less usual methods of firelighting with friction through use of the Pump drill and Hand drill.
Students will have the opportunity to make these judgements for themselves, reassess and try again. This will ensure that they not only have the success in the task that they require but also apply the aspects of their knowledge to a practical task.
