Spring Quiz...A quiz about springs for students: A hanging spring has a mass attached. The system then reaches equilibrium. The mass is pulled down and then released. The process is animated; at each stage students are asked to answer questions about kinematics (position, speed, acceleration), forces (weight and spring) and energy (gravitational potential, kinetic, spring potential, and conservation).Each question of the 34 questions allows for three attempts and one hint, and the app keeps trac