Take a look at this train in Figure 1.11. It looks very futuristic. What do you notice about it? Did you notice that the train has no wheels? How can a train have no wheels? It doesn't need wheels. It actually floats, or levitates, just above the track. Magnets enable the train to do this. This is not a normal train. This is a maglev train. The word maglev stands for magnetic levitation. Because it has no wheels, there is no friction. Some magnets hold the train up. Other magnets are used to move the train forward. This train can go very fast. It can reach speeds up to 480 kilometers (300 miles) per hour! Magnets are pretty cool. What exactly is a magnet? How is it able to exert such force?

Question: "How does the train move?"

Response: "Steam"

A: no

Mechanical energy is a combination of the energy of motion or position. This type of energy describes objects that are moving or could move. A moving ball can have energy from motion. An arrow can also have the energy of motion. Both are types of mechanical energy. Can you think of some other examples? Where does the energy of motion come from? It comes from the energy created by position. This energy is stored energy. This means it is not moving yet, but it has the potential to move. How can you store energy? The arrow gains energy from the drawn bow. As the arrow is released, the bow releases its stored energy and puts the arrow into motion. Can you think of some other ways to store energy using position?

Question: "Why is mechanical energy considered a combination of the energy of motion and position?"

Response: "Because objects either move or could move"

A: yes

Marsha loves playing with her noodle friend. She had it for a long time so it is now a dark brown color. When her mom first made it, it was white. The night she met her noodle friend was spaghetti night. Marsha's favorite dinner was spaghetti, which happened to be every Tuesday night. On one Tuesday, a piece of spaghetti fell on the kitchen floor. To Marsha, it looked like a stick man so she kept him. She named her new noodle friend Joey and took him everywhere she went. Sometimes Joey gets a little dried out so Marsha's mom told her to soak him in water every few days. There were a couple times that the family dog, Mika, has tried to take Joey from Marsha and eat him! So from now on, Marsha takes extra special care to make sure Joey is safe and sound at all times. During the day she keeps him in a plastic bag in her pocket. At night, she puts him under her pillow. She loves Joey and wants to always be friends with him.

Question: "On what day of the week did Marsha meet Joey?"

Response: "Monday"

A:
no