(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A cylinder of mass M and radius R rolls(without slipping) down an inclined plane whose incline angle with the horizontal is Θ. Determine the acceleration of the cylinder's venter of mass.(Derive the formula)

2. Relevant equations

I have the answer, but I just don't understand:

∑τ=Iα, use the parallel-axis theorem and a=Rα.

(Mg sin Θ)R=(1/2MR²+MR²)(a/R)

Rg sin Θ=3/2Ra

a=2/3g sinΘ

3. The attempt at a solution

Here's my question. Why do we need to use the parallel-axis theorem? isn't that the torque is just 1/2MR² ? Maybe I am confused with the concept of Torque. I don't know...Please help!!!

**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: Acceleration of an object rollling down a incline.

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