A child rubs a rubber ruler and then puts it near some tiny pieces of paper. The paper pieces are attracted to the ruler why?

the rubbing activity makes the ruler become charged and it will attract the paper pieces to the ruler as the positive and negative charges attract each other

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .