Physics 11 – Today the students worked through the formula for Universal Gravitation. The students felt pretty good about how gravity works, having covered it conceptually already. However, there were still a few surprises (mostly for me).
It became apparent to me that many students consider the re-ordering of variables in a formula as something that makes a new formula. For example, after rearranging the formula to solve for r, separation, I was asked several times if the students would be given this formula on the formula sheet.
The second big surprise was being asked if the N*m^2/kg^2 units for G were variables, and what numbers should be plugged into them.
The above two misconceptions will have to be something that I specifically address again the future.