Why sliding friction is greater then rolling friction

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Consider two metallic rods mounted on insulated supports. one is neutral, the other positively charged. you bring the two rods close to each, but without contact, and briefly ground the the neutral rod by touching it with your hand. show answer correct answer what would be resulting charge (if any) on the initially neutral rod

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate