Explanation
Rolling friction is less than sliding friction.Alternative explanation: That’s why the wheel was such a great invention!
What can you infer about the coronary arteries? They carry blood
Gravity is a force of attraction that exists among all objects. Every object attracts every other object. Most objects are too small for their gravitational force to be measured or even noticed. Because the earth is large, its gravitational force is very strong. Gravity holds things on Earth's surface as it draws everything toward the center of the planet. Suppose that a very narrow tunnel has been drilled straight through Earth's center as shown in the diagram. What will the marble MOST LIKELY do if it is dropped into the tunnel?
Buoyancy and a Tank