Frictionless sliding vs sphere rolling on an inclined plane

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lshachar
Posts: 9
Joined: 01 Aug 2015, 18:00

Frictionless sliding vs sphere rolling on an inclined plane

Post by lshachar » 03 Aug 2015, 15:47

Hi everyone,
I'm new to V-rep (and robotics simulation) and really loving it so far! :)
Thank you goes for the developers!

I have a 5 degrees incline on a resizable floor, with a sphere made from high friction material, and a cuboid made from friction less material.

for some reason, the frictionless cuboid slides down the plane faster than the sphere (that is rolling down)

I believe that both object should have exactly the same acceleration.. but I might be in the wrong here, making a basic physics mistake.

So, is something not modeled properly? is the physics wrong on the simulator or in my head? please help me out :)

Here's the scene file:
https://dl.dropboxusercontent.com/u/256 ... cuboid.ttt


Thank you!
Shachar

coppelia
Site Admin
Posts: 7226
Joined: 14 Dec 2012, 00:25

Re: Frictionless sliding vs sphere rolling on an inclined pl

Post by coppelia » 03 Aug 2015, 17:25

Hello Sachar,

your sphere is rolling and translating: it accumulates energy as rotational and translational energy. Your box is only accumulating energy as translational energy. So this is normal.

Cheers

lshachar
Posts: 9
Joined: 01 Aug 2015, 18:00

Re: Frictionless sliding vs sphere rolling on an inclined pl

Post by lshachar » 03 Aug 2015, 17:56

That makes perfect sense... thank you :)

I would've suggested past-self to read this article:
http://www.batesville.k12.in.us/physics ... e_roll.htm

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