A high first hill of a roller coaster ensures that it has a lot of   energy.  To keep the roller coaster moving fast, it should have  little rolling, sliding, and fluid friction.Word Bank:littlegravitational potentiala lotkineticBlank 1:

To keep the roller coaster moving fast, it should have little rolling, sliding, and fluid friction. This means that the roller coaster should experience minimal resistance from these types of friction.

To understand why, let's break it down step by step:

1. The roller coaster starts with a high first hill. This means that it has a lot of gravitational potential energy. Gravitational potential energy is the energy an object possesses due to its height and the force of gravity acting on it. So, the higher the first hill, the more potential energy the roller coaster has.

2. As the roller coaster goes down the first hill, its potential energy is converted into kinetic energy. Kinetic energy is the energy of motion. The roller coaster gains speed and momentum as it goes down the hill.

3. However, as the roller coaster moves along the track, it encounters various types of friction. Friction is the force that opposes motion between two surfaces in contact. In the case of a roller coaster, there are three types of friction to consider: rolling friction, sliding friction, and fluid friction.

4. Rolling friction occurs when the roller coaster's wheels roll along the track. To minimize rolling friction, the roller coaster should have smooth wheels and a well-maintained track. This allows the wheels to roll smoothly without excessive resistance.

5. Sliding friction occurs when the roller coaster's body slides against the air or other surfaces. To minimize sliding friction, the roller coaster should have streamlined shapes and minimal protrusions. This reduces the surface area in contact with the air or other surfaces, reducing the frictional force.

6. Fluid friction occurs when the roller coaster moves through a fluid, such as air or water. To minimize fluid friction, the roller coaster should have aerodynamic designs. This allows it to move through the fluid with minimal resistance.

In conclusion, to keep the roller coaster moving fast, it should have little rolling, sliding, and fluid friction. This can be achieved by having smooth wheels, a streamlined design, and an aerodynamic shape. By minimizing these types of friction, the roller coaster can maintain its speed and energy throughout the ride.