Ключевые слова: adventure, amusement, amusement park, attraction, carnival, challenge, circuit, city fair, enjoyment, entertainment, fairgrounds, fear, frightful, fun, funfair, game, gravity, hill, joy, kinetic energy, leisure, loop, montanha russa, party, play, playground, pleasure, potential energy, railroad, recreation, ride, rider, roller coaster, russian mountain, safety, scare, selfpowered, theme park, toboggan, track, trail, upside down, vacation,