ice plant: Old World annual widely naturalized in warm regions having white flowers and fleshy foliage covered with hairs that resemble ice
fig marigold: any of several South African plants of the genus Mesembryanthemum cultivated for showy pink or white flowers
ballistic pendulum: a physical pendulum consisting of a large mass suspended from a rod; when it is struck by a projectile its displacement is used to measure the projectile's velocity