Monday, September 29, 2014

9_18_2014 Electric Field

These are some animal skins that Mr. Mason got when bartering on the Oregon Trail.

Calm down. This is not magic. It is a an electrical field holding that balloon to the glass. I will explain.

This is silk. It hates animal fur. They produce different electrical fields when rubbed against a balloon.

This is a quantitative formula for calculating electrical fields. That is a free body diagram. #Physics.

This is a layman's definition of charge. Included is a very similar definition of mass. #Chemistry.
This is the free body diagram regarding the balloon on the window.

This is the sum of forces looking at the charge that is pushing or pulling something with a like charge. In this case it is a hanging charge being pushed by another charge.


This is the tracking of two magnets moving closer together and the calculation of the force constant or the electrical field caused by the proximity of the charges.

This is a physical simulation and conversion from the chart.Conclusion:Yes, we were able to tell immediately that it was an inverse relationship. Then by looking at the slope we figured it must be and inverse square due to the steepness of the graph. They are the same value, so the percent difference is 0. However our equation for the function does not accurately describe the function too 100%. A=kq^2 => q = sqrt(A/k)= 5.25 * 10^-8A=k(q/2)(q)=k(q^2/2) => q = sqrt(2A/k)= 7.43 * 10^-8 and q/2 = 3.72*10^-8No, we derived the force in the x direction from using a fbd and equations for static equillibrium. Since this is what we used for our force equation our force will only be positive since distance is positive (measure from origin). Hence the best we can do is find the absolute value of q.Uncertainty for force can be found, systematic error can be found for not accounting for the mass of the string string and small things like friction and minute spinning of the string. We also assume that acceleration is equal to zero.

This is a van de graaff generator. It gathers electrostatic and causes the outside to share the same charge as things that touch it.
this is the mechanism that creates the static charge. The copper wires are pulling electrons off the rubber, but at the bottom the rubber is regaining electrons from the base.



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