problem Taking trigonometry series-ly Age 16 to 18 Challenge level Look at the advanced way of viewing sin and cos through their power series.
problem Differential equation matcher Age 16 to 18 Challenge level Match the descriptions of physical processes to these differential equations.
problem It's only a minus sign Age 16 to 18 Challenge level Solve these differential equations to see how a minus sign can change the answer
article Modelling Assumptions in mechanics An article demonstrating mathematically how various physical modelling assumptions affect the solution to the seemingly simple problem of the projectile.