21. Which has the least gravitational potential energy-a 5 kg ball that is 3 meters high or a 3 kg ball that is 3 meters high?

Picture a all traveling at a constant speed around the inside of a circular structure. is the ball accelerating? explain your answer

Which expression allows you to determine the mechanical advantage of an inclined plane? a. height of plane / input force b. length of plane / input force c. length of plane / height of plane d. height of plane / length of plane

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question