sentences: a bowling ball is a kind of object & a falling object contains mechanical energy & the bowling ball falls onto the floor ->  the bowling ball contains mechanical energy when it is falling onto the floor  the bowling ball contains mechanical energy when it is falling onto the floor & when two objects are touched , sound is produced0 & a bowling ball is a kind of object & the floor is a kind of object ->  the bowling ball containing mechanical energy touches the floor  the bowling ball containing mechanical energy touches the floor & when two objects are touched , sound is produced ->  the bowling ball containing mechanical energy touching the floor produces sound  the bowling ball containing mechanical energy touching the floor produces sound & sound is produced when mechanical energy is transformed into sound energy ->  the mechanical energy in the bowling ball is transformed into sound when it touches the floor  friction occurs when two object 's surfaces touch each other & the bowling ball contains mechanical energy when it touches the floor ->  friction occurs when the bowling ball containing mechanical energy touches the floor  friction occurs when the bowling ball containing mechanical energy touches the floor & friction converts mechanical energy into heat energy ->  the mechanical energy in the bowling ball is converted to heat energy when it touches the floor  the mechanical energy in the bowling ball is transformed into sound when it touches the floor & the mechanical energy in the bowling ball is converted to heat energy when it touches the floor -> the mechanical energy in the bowling ball is converted into heat and sound energy when it touches the floor