There are 2 types of charges positive (acetate) and negative (vinyl). An acetate strip carries a positive charge when it gets rubbed with a piece of cotton. Vinyl on the other hand gets a negative charge when its rubbed with wool. If two positively charged items get close together they repel. When two negatively objects get close together they also repel. If you put a positively charged item close to a negatively charged item they attract. When you put a neutral object close to a positive/negatively charged object, the neutral object attracts the charged object.
2 Types of Charge
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Great post! Thanks for including the embedded videos. They make your post really stand out. Great answers as to what you found during the lab. They are bang on. Good work!