Teachers Notes

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This is a subject that is covered in great detail in Physics. KS4/GCSE Physics goes on to cover real world application of Impulse which teachers and students, alike, can research separately (the normal examples are ones involving car collisions, click here for a link to Google to search material). Here we are covering the Physics and the associated mathematics only.

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Remember in the section on the Conservation of Momentum we introduced the idea of a force acting on a body will change that objects momentum. In this section it is important to understand that it is the combination of the resultant force applied and the time that the force is applied for that is important.

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A subject that students (and from experience non specialist Physics science teachers) do not take seriously (and they should) is the importance in understanding SI Units. Here is a great example of why it is important to understand.

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As you go through the videos students will come to understand that Impulse is Force x time which is equal to the Change of Momentum. Now the SI Unit for momentum is Kg m/s. We know that the SI Unit for Force is Kg m/s  and we know that the SI Unit for time is s. When you multiply Kg m/s  by s, two of the s's cancel out and we are left with  Kg m/s which is the SI Unit for momentum. So, understanding SI Units allows students to double check that they are using the correct variables in Physics formulae.

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