Unit 2 · 4 lessons
Energy and Momentum
The two quantities that are never created or destroyed: work and energy with friction and springs, simple harmonic motion, impulse, and collisions in one and two dimensions.
- 45 practice questions
- 32 flashcards
- 1 interactive lesson
Lessons
- 1Work, Energy and the Work-Energy TheoremWork done by a force at an angle, the theorem that links net work to a change in kinetic energy, conservation of energy when friction turns some of it into thermal energy, and power.11 questions
- 2Springs and Simple Harmonic MotionHooke's law, the energy stored in a stretched or compressed spring, how a mass on a spring trades elastic and kinetic energy, the period of simple harmonic motion, its link to circular motion, and damping.11 questions
- 3Momentum and ImpulseMomentum as mass times velocity, the impulse that changes it, reading impulse as the area under a force-time graph, and why helmets, airbags and crumple zones work by stretching out the time of a collision.11 questions
- 4Collisions in One and Two DimensionsConservation of momentum, telling elastic from inelastic collisions by checking kinetic energy, explosions and recoil, and solving two-dimensional collisions by components.Interactive12 questions