December 15,2010

wedsnday december 15, 2010

today was pretty much a review day. first we had to think about the following situations. we had to put them in order by the amount of energy in the end of A B and C. nobody got it right at first. Mr finley drew a dotted line through the inital and final states. the displacement of a and b are the same. A has the same amount of gravitational as B has the same amount of kinetic. - kathleen answered that correct. C has less energy because the displacement was smaller.



after we went over that problem, we went over the unit 8 problems. the the ramps cant be steep and have to meet the regulations 1:12.

Mr. Finley took a spring scale that measures newtons and showed us how it works.

Conner built a ramp using his books and a white board. a weight... .25 newtons just hanging in the air, .1 when he drags the weight across the white boars. less force is used but there is longer displacement.

we went over 8.4...


turn a mass into force, then turn 30 grams into .3 killogram
drawing a bar chart could help you.

foce * displacement = work
everyone did the problem

intiial- compressed
final-in the air 50j

how high?

if work = force * displacement

30g/1000 = .03kg * 10 ( to make newtons) =.3 n
50j=0.3 *xw= force
50 / 0.3= 166 2/3n

GP
homework... check activity paket. review!!!!! ps the website is down so make sure you get the homework before you leave class