im suppose to do some calculations to prove whether or not the pendulum demonstrates the law of conservation of energy.(adsbygoogle = window.adsbygoogle || []).push({});

mass of pendulum = 240.3g = 0.2403 kg

diamter of pendulum bob = 3.50

initial height of pendulum bob = 48 cm = 0.48 m

length of pendulum string = 2.14 m

time interval of photogate light interruption = 11.8 m/s

so there's position 'A' and position 'B'

for 'A"

Emechanical = Ek + Eg

= (0.5)mv^2 + mgh

= 0 + (0.2403kg)(9.8)(0.48m)

= 1.13J

for 'B'

Emechanical = Ek + Eg

= (0.5)mv^2 + mgh

= (.5)(0.2403kg)(11.8^2) + 0

= 16.73J

i must be missing something (my calculations aint proving anything).. any help will be appreciated!

~Amy

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Pendulum lab

**Physics Forums | Science Articles, Homework Help, Discussion**