30 multiple-choice questions covering all 4 topics of Unit 7 — SHM, period/frequency, sinusoidal motion, and energy in oscillators. Use g = 10 m/s².
Memorize the two period equations. Spring: T = 2π√(m/k). Pendulum: T = 2π√(L/g). Notice neither includes amplitude.
Sketch the motion before calculating. Where is the object when v is max? Where is it when a is max? These should be automatic.
For energy problems, total energy is fixed. ½kA² for a spring oscillator. At any point, ½kx² + ½mv² = ½kA².
Amplitude doesn't change period. A common trap. Bigger amplitude does mean bigger max speed and bigger max KE — but period stays the same.