Plastic Bag Lab Pg. 21

Answer the following questions  What happens when you rub your feet on the floor and then touch the door knob? o Was there a charge produced? Y or N o Which object has the charge feet or door knob? o Answer: You feel a “shock”

 Question/Problem: What makes objects attract and repel? o Hypothesis: If objects are charged then they will attract or repel because the charges affect its behavior.

Plastic-HandPlastic-DeskPlastic-Plastic Result? (Attract or Repel) Drawing Before Rubbing Drawing After Rubbing

Activity #1-Hand to Plastic  Cut 2 strips from a plastic grocery bag so that each is about 2–4 cm wide and about 20 cm long. o Hold the plastic strip firmly at one end. Then grasp the plastic strip between the thumb and fingers of your other hand. o Quickly pull your top hand up so that the plastic strip runs through your fingers. Do this three or four times. o Allow the strip to hang down. Then bring your other hand near it. o Write “attract” or “repel” in the chart on the activity sheet to describe what happened

Report your Results-Hand to Plastic  What happened?  Draw pictures of how the charges were interacting between your hand and the plastic

Activity #2- plastic to desk  Charge one strip of plastic the same way you did previously.  This time, bring the plastic strip toward your desk or chair.  Write “attract” or “repel” in the chart.

Report your Results-Desk to Plastic  What happened?  Draw pictures of how the charges were interacting between the desk and the plastic.

Activity #3-Plastic to Plastic  Charge two strips of plastic  Slowly bring the two strips of plastic near each other.  Write “attract” or “repel” in the chart on the activity sheet.

Report your Results-plastic to plastic  What happened?  Draw pictures of how the charges were interacting between the plastic and plastic

Results  What can we infer about charges and particles that make up the substances around us?

Activity #4-Balloon and paper confetti  Rub a balloon on your hair or clothes.  Bring the balloon slowly toward small pieces of paper

Report your Results- paper confetti and balloon  What happened?  Draw pictures of how the charges are interacting between the confetti and the balloon.