PHY 317K 1st Edition Lecture 8Outline of Last LectureI. Work at an angleII. Potential EnergyIII. Kinetic EnergyOutline of Current LectureI. PowerII. The Force of GravityIII. Center of MassIV. MomentumCurrent LecturePower:- Power is energy divided by time- P = w/t- P = Fx/t - P = Fv (force times velocity)The Force of Gravity:- F = G m1 m2 / r^2- M1 = large mass- M2 = small mass- So the acceleration of the small mass can equal a = GM/ r^2 by rearranging the equation- G is the universal constant of gravitation - G = 6.67 x 10^-11 Nm^2/Kg^2Center of Mass:- The point on an object where the mass is evenly distributed- This point can be balanced if held up in the air- M1D1 = m2D2- The center of mass on point x is given by the summation of all the masses and the distance on point x divided by the entire massMomentum:- Linear momentum is given by mass times velocity- Linear momentum is conserved- If we have a large and a small ball that collide, the one with a larger mass will have a smaller final velocity than the small
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