I have a counterweight system I am trying to develop. One of my associates and I are in disagreement over something though.(adsbygoogle = window.adsbygoogle || []).push({});

The system is simple, it is effectivly two 850 Lb weights connected together by a chain. The chain is suspended by two pulleys. One of the pulleys is connected to motor. I am trying to calculate the torque required to move the system 40 inches in 1 second.

I believe the only forces that I have to overcome is inertia due to acceleration and the system friction. Assuming there is no friction the inertia is all that is l have to overcome.

Here is my question: Is the inertia load 1700 Lbs or 850. My associate says gravity will remove one of the loads but if gravity acts on both weights shouldnt it cancel out?

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

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!

# Inertia due to acceleration

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