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When you are sitting in a chair, you have potential energy stored in your body due to your position and height above the ground. This potential energy can be converted into kinetic energy if you stand up or move.
There is one commercial with an Egg Chair by Arne Jacobsen and another with a swan chair by Arne Jacobsen. You can check my blog for chairs... Chaircards.wordpress.com
I strongly believe that a leather chair is the best kind of leather furniture available. specificly a Lazyboy leather chair. They are great for sitting in the living room and reading a book or watching tv.
Depending on what kind of chair Ur looking for and what Ur gonna us it for besides sitting. I have a Coleman MAX chair I got from Walmart its awesome I have had it for 2 years. It's dependable and it holds up to 350 pounds.
static friction
A beach chair.
Sliding Friction
Sliding Friction
heat friction
an adjustable chair can be raised and lowered.
To find out what kind of caster wheels you need for your chair at home is to look at the chair and see what kind of wheels it has. Go to retail store like Canadian tire and purchase those wheels to replace it on your chair.