Maths, Physics Revision Physicss Maths Physics Physics A Level Physics Home Maths Maths Revision hut Simple Harmonic Motion Displacement x varies with time according  to one of two equations x= A cos(2πft) if you start timing at max displacement x=Asin(2πft)  if you start timing at the midpoint Potential enrgy Kinetic energy Potential energy and kinetic energy interchange in SHM Potential energy is max when kinetic energy is min Graphs showing displacement, velocity and acceleration displacement acceleration velocity + + + - - -