# several questions on an experiment on electrostatics

by iknownth
Tags: electrostatics
 P: 16 Move a can without touching it 1. Place an empty aluminium can on a table so that it can roll freely. 2. Rub an inflated rubber balloon on your hair. 3. Hold the rubbed balloon several centimetres away from the can and move it away from the can slowly. 4. Put the balloon on the opposite side and see if the trick still works. My questions: 1) What makes an object roll? It is obvious that a heavy object cannot roll easily, so, can the mass of an object determine whether it can roll or not? 2) Is the rubbing effect in step 2 still significant for steps 3 & 4? 3) "The aluminium can is an neutral object and the rubber balloon is positively charged after rubbing with hair. Thus, it can attract the aluminium can." Is it what the experiment what to imply? Thanks in advance.
 Math Emeritus Sci Advisor Thanks PF Gold P: 38,712 Where did you get these questions? They look an awful lot like basic homework questions. If so, this should be in the "homework" section. Even if not, it won't do you any good for someone else to answer them until after you have thought about it for a while yourself. Do you know anything about "electro-statics"? Do you know what "induced charge" is? What do you think is happening here?
 P: 16 ...... These are my questions and I have thought about it for some time. I really don't understand. "The aluminium can is an neutral object and the rubber balloon is positively charged after rubbing with hair. Thus, it can attract the aluminium can." This is what I think is happening here. I just know that there is charging by rubbing and an attraction between a neutral object and a charged object.
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