A horizontal force of 80 N is required to push a bookcase across a floor at a constant velocity. How much friction acts on the bookcase when it is at rest on a horizontal surface without being pushed?

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2

Which statement correctly describes the interaction between magnetic poles? north and south poles attract each other. north and south poles repel each other. two north poles will attract each other. two south poles will attract each other.

What effect does the sun have on the earth. written response