LAB Static-electricity

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Will the mass of an insulator be affected by friction?
OUR EQUIPMENT
 Paper
______________________________________________
 Plastic Ruler







Pen
Plastic comb
Polystyrene
Polythene rod
Metal spatula
Balance (2 d.p)
Cloth
METHOD I
 Obtain the mass of the ruler and record it
 Use a cloth to firmly rub the ruler 10 times and reweigh. Record the new
mass.
 A higher mass implies that the material has gained electrons and so the
charge is negative.
 A lower mass implies that the material has lost electrons and so the charge
is positive.
 Use the metal spatula to hover over the whole surface of ruler without the
two objects touching for about one minute.
 Reweigh the material
 Repeat for all the materials.
MY PREDICTIONS (what I think will happen)
The mass of each material will be
affected. Either it will decrease or increase
indicating that electrons have moved.
RESULTS TABLE
Object
Initial
mass(g)
Final
mass(g)
Charge
+ or -
Friction causes electrons to be removed or
transferred to an insulating material
LBTSJIC 23/02/15
Mass
after
discharge
(g)
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