4.1 work done by a constant force
4.2 kinetic energy + work-energy theorem
4.3 gravitational potential energy
4.5 the law of conservation of energy
4.6 elastic potential energy & simple harmonic motion
4.7 springs and conservation of energy
5.2 conservation of momentum in one dimension
5.4 head-on elastic collisions
5.5 collisions in two directions: glancing collisions
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energy and momentum