Way Cool Science! 1.Cut a paper circle the size of the petri dish 2.Cut a simple symbol or your initial into paper 3.Add flour to the dish – Evenly spread flour on base of dish 4.Attach circle to outside of lid with tape 5.Gently rub the lid area for about a minute 6.Carefully remove stencil 7.Place lid on dish 8.Hold lid and turn dish upside down then right side up Why is this useful?

Making Use of Static Charges

Photocopiers

Electrostatic Spray Painting Use electrostatic to help waste less paint – Normally lose paint because doesn’t stick to surface and sprays everywhere Paint coming out of nozzle gains a negative charge via friction Surface is given positive charge Less waste and no overspray

Electrostatic Precipitator Gas discharge from factories may contain pollutants (known as particulate matter) Gas is sent through negatively charged pipes – Charges particulate matter Gas passes through positively charged plates – Particulate matter is attracted to plates

What Else? Think of a way we can use static electricity to help our daily lives

Homework Page 426 # 5, 8, 10-14