Why can't the second hill on a roller coaster ride ever be as high as the first?

That pushes you forward. And why people can hang upside down in them? Of physics: energy, inertia, and gravity.

A roller coaster does not have an engine to generate energy. Pulls the train up. Is pulled by gravity.

To go up the next hill. Hill, and the faster the train will go. Are forces that work to slow down the train.

Energy to get up them. Wooden and steel. From flipping off the track.

In the 1950s tubular steel tracks were introduced. Travels through intricate loops and twists. Of the car.

Keep you in your seat. Keeps you in your seat. Body to the outside of the loop as the train spins around.

For safety and comfort. How do we know whether a roller coaster is safe? Designers follow industry standards and guidelines.

Sandbags or dummies. A track 18 miles down a mountain to transport coal. It became a scenic, albeit bumpy, pleasure ride.

Island, Brooklyn, NY, in 1884. At Coney Island, Brooklyn, NY (1907). Started to be used.

The first tubular steel coaster was the Matterhorn Bobsleds at Disneyland, Anaheim, CA (1959). To completely invert passengers. 2000, Nagashima Spa Land, Japan, at 8,133 feet/2,479 m.

It is also the fastest at 128 mph/206 km/h.