1) The document discusses potential and kinetic energy, with a focus on using potential energy experiments involving trolleys rolling down slopes and pendulums to understand how potential energy is converted to kinetic energy. 2) It provides formulas for calculating potential energy (PE = mgh), kinetic energy (KE = 1/2 mv^2), and velocity (v = √2gh) and discusses their application to roller coaster design. 3) The steps outlined for a roller coaster design experiment involve calculating the potential and kinetic energy at various points and using that to determine the track design and roller coaster speed and energy requirements.