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### 27 Cards in this Set

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 A period in a pendulum is one back and forth motion. True or False? True. A one second pendulum is shorter than a 2 second pendulum. True or false? True. The amplitude of a wave is different for the crest and trough. T OR F? False. Period Equals one over frequency AND frequency equals one over period. T OR F? True. The medium in which a wave traveks moves with the wave itself. TRUE OR FALSE? False. The velocity of a wave equals frequency divided by wavelength. T OR FALSE? False. The frequency of a wave equals velocity divided by wavelength. TRUE OR FALSE? true. For a transverse wave, the medium moves parallel to the direction of the wave. TRUE OR FALSE? False. For a longitudinal wave, the medium moves perpendicular to the direction of the wave. TRUE OR FALSE? False. Destructive interference causes standing waves. TRUE OR FALSE? False. The amplitude affects the period of a mass-spring system. TRUE OR FALSE? False. The mass affects the period of a mass-spring system. TRUE OR FALSE? True. The stiffness of a spring affects the period of a mass-spring system. TRUE OR FALSE? True. A pendulum clock that works perfectly on earth will run slower on the moon. TRUE OR FALSE? True. The speed of a wave depends on the amplitude of the wave. TRUE OR FALSE? False. The greater the amplitude, the greater the energy the wave carries. TRUE OR FALSE? True. A pendulum that works perfectly at sea will run slower on Mount Everest. True. What is simple harmonic motion? When the net force along the direction of motion is proportional to the displacement and in the opposite direction like F = -kx What supplies the force that creates the simple harmonic motion for a mass-spring system? The Spring Why does amplitude not affect the period of a mass-spring system longer? The further you pull it, the more force there is, but it has a longer distance to travel. Why does more mass make the period of a mass-spring system longer? The force for a mass spring system comes from the spring. The force is based on displacement. Adding more mass doesn't change the amount of force that the spring can supply, so the system slows down, thereby increasing the period. Why does more stiffness make the period of a mass-spring system less? The stiffness or spring constant changes the period because it changes the force the spring can provide. If you look at F = -kx , you see that the greater the k, the more F is, and the shorter the period will be. Likewise, the smaller k is, the less f is and the longer the period will be. What supplies the force that creates the illusion of simple harmonic motion for a pendulum? Gravity supplies the force. The motion is only simple and harmonic for small angles (up to 20 degrees) Why doesn't amplitude matter for a pendulum? Having a greater amplitude for a pendulum increases the force, but also increases the distance you need to travel. Why doesn't pushing a pendulum initially change the period? Pushing a pendulum initially only increases the force, but also increases the distance that you need to travel. Why doesn't mass change the period of a pendulum? The more mass, the more gravity pulls on the pendulum. However, the more mass, the more difficult it is to move the pendulum. Having more gravity cancels the fact that it is harder to move. Why does length change the period of a pendulum? Length changes the period of a pendulum because the placement of the mass relative to the axis of rotation affects the rotational inertia. Small rotational inertia = short periods. Large rotational inertia = long periods.