
modules = [
        'mechanics',
        'electrodynamics',
        'modern-physics',
        'optics'
        ]

chapters_mechanics = [
        'kinematics',
        'projectile',
        'laws-of-motion',
        'work-energy-power',
        'circular-motion',
        'rotation',
        'center-of-mass',
        'gravitation',
        'simple-harmonic-motion',
        'elasticity',
        'fluid-mechanics',
        ]
chapters_electrodynamics = [
        'electrostatics',
        'current-electricity',
        'capacitors',
        'magnetics',
        'electromagnetic-induction',
        'alternating-current',
        'electromagnetic-waves'
        ]
chapters_optics = [
        'ray-optics',
        'wave-optics',
        ]
chapters_modern_physics = [
        'atomic-structure',
        'photoelectric-effect',
        'x-rays',
        'nuclear-physics',
        'semiconductors',
        'communiation-system'
        ]

chapters = [chapters_mechanics, chapters_electrodynamics, chapters_modern_physics, chapters_optics]

chapters_list = chapters_mechanics + chapters_electrodynamics + chapters_modern_physics + chapters_optics


