No not yet but they might someday.
They are not
According to Roller Coaster Data Base, there are currently 174 wooden roller coasters operating around the world.
"In 1959, the Disneyland theme park introduced a new design breakthrough in roller coasters with the Matterhorn Bobsleds. This was the first roller coaster to use a tubular steel track. Unlike conventional wooden rails, tubular steel can be bent in any direction, which allows designers to incorporate loops, corkscrews, and many other maneuvers into their designs. Most modern roller coasters are made of steel, although wooden roller coasters are still being built." - Wikipedia
I believe not.
11. But, there will be one more added in the Spring of 2012 to make it a total of 12.
Loops and corkscrews are vital components of roller coasters because they enhance the thrill and excitement of the ride by providing intense vertical and lateral G-forces that create a sense of weightlessness and adrenaline. These elements also contribute to the overall design and engineering of the coaster, allowing for more complex and dynamic paths that engage riders. Additionally, they serve to differentiate roller coasters, attracting enthusiasts seeking unique experiences. Overall, loops and corkscrews play a crucial role in maximizing the enjoyment and entertainment value of the ride.
The Carts for the roller coaster are attached and hooked around the track so it can do anything to the extreme such as, up side down turns, corkscrews, and so forth
Some do. A wooden one usually does, but sometimes you can find some that don't. And steel roller coasters almost never do.
If you are looking for a palm sweating, fun time, the wooden roller coaster sways a lot more.
At Cypress Gardens a boy stood up on a wooden roller coaster and died
Depends on the manufacturer, speed, height and the actual ride.
All roller coasters have at least one hill and one drop. Most roller coasters also have turns as well. Inversions (going upside down) is typical on steel coasters and rare on wooden ones. Their is always some way to start a roller coaster, a chain or hydraulic launch systems are some. Brakes are on every roller coaster as well.