Anna hawkins - station 7!
I did station seven and the whole gist of this lab was that there was a fan cart on a ramp with a 7 degree incline. The fan would only remain stationary if the fan was on a high enough level. The higher the incline, the faster the fan needed to be spinning. When the cart is stationary on the ramp the net force is zero, we know this because the net force is not accelerating. THere are three forces acting on the cart. The force of gravity on the earth was acting downward at a 270 degree angle. The force of the air is moving to the left at a 187 degree angle, and the normal force is acting upward at a 97 degree angle. Another reason that we know that the net force on this object is zero is because the three vectors(forces) all add up to equal zero.
Monday, November 9, 2009
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I also did station 7, which was the station with the fancart on the inclined track. My groups' big understanding of this station was that you could keep the cart's acceleration equal to zero at any point on the track, but the further up the ramp the cart was, the more air restance the cart needed to have acceleration = zero. I also learned that we can prove that the Fnet=0 by drawing a proprtional triangle by adding the vectors together to form a triangle.
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