## Conservation of Energy Ranking Task

**A) Rank each pendulum on the basis of its initial gravitational potential energy (before being released).**

a) m=8 kg; h=15 cm; U = (8)(9.8)(0.15) = 11.76 J

b) m=1 kg; h=60cm; U = (1)(9.8)(0.6) = 5.88 J

c) m=2 kg; h=60 cm U = (2)(9.8)(0.6) = 11.76 J

d) m=3 kg; h=45 cm; U = (3)(9.8)(0.45) = 13.23 J

e) m=4 kg; h=30 cm; U = (4)(9.8)(0.3) = 11.76 J

f) m=2 kg; h=30 cm: U = (2)(9.8)(0.3) = 5.88 J

=>

From largest to smallest: d, (a,c,d), (b,f)

**B) ****Rank each pendulum on the basis of the maximum kinetic energy it attains after release.**

h = |45, m=3| **> |**m=2, h=60| , |m=4, h=30| , |m=8, h=15| **>** |m=2, h=30| , |m=1, h=60|

**C) ****Rank each pendulum on the basis of its maximum speed.**

## Comments ( 2 )

Number two is completely wrong

Bill, look again its right if you overlap them