Science test tomorrow! Question help?

Posted on 2015-10-30 12:36:00 in Physics by ELLIE

If sparks are caused by 2 insulators rubbing together, then why can't we create sparks with 2 pieces of felt rubbing together. (I know you can cause sparks with stone - how is that?)

I'm really confused with this topic. Please keep it simple because I'm doing add. physics GCSE (ok not THAT simple). If this came up in my test, then I would probably use your answer as an answer, so please could you try and make sure it's answer-worthy :)

thanks so much

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