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This just in!!! A young physicist of only 17 years old has just calculated the acceleration due to gravity on planet earth. In Irondequoit high school in Rochester New York a group of mere students proved the age old physics fact. Blind faith couldn’t satiate their thirst for knowledge. Armed with a ball, tape measurer, and stop watch these physics fighters set out with a mission: find gravity’s acceleration. Excuse me, I’m receiving their procedure now……It looks as if they had one person start with the ball at a fixed point and then the same person let go of the ball and measured the time it took for the ball to go from the point to the floor. This was done with a stop watch. They repeated this procedure three times. Knowing that the initial velocity was 0 they then proceeded to calculate the acceleration due to gravity using the formula d= vit+ 1/2at^2. This came out to be 13.29 m/s^2. There was a bit of error in their calculation due to the equipment they possessed. They also calculated their percent error and found that it was 35.474 percent. This was most likely due to the variation in their three measurements. Regardless of the variation this was a great discovery in Mr. Fullerton’s class as well as a great confirmation in the world of physics -Jamie D

I'm hoping this is the right place to post for Physics C Problems. I thought I heard that people were confused by the billiards web assign so I thought I'd weigh in. To me it seems like the velocities of the cue ball and the 8-ball have been switched on the webassign, but maybe I'm crazy. Also, I only know from experience that perfectly spherical billiard balls that collide perfectly tangentially ricochet off each other at complimentary angles, but the mathematical explanation in the answer packet leaves a bit to be explained for me. Any clarification would be much appreciated!

I just did the ruler under the newspaper thing Mr. Fullerton showed us in class for my family and it worked! I was so proud of myself