Question 3(Multiple Choice Worth 2 points) In order to be considered work, the components that must be present are
O a force and a movement in the same direction as the force
an action which causes movement and an opposite reaction
an action which causes no movement or reaction
О O
a force and a movement in the opposite direction of the force

When fat comes in contact with sodium hydroxide, it produces soap and glycerin. determine whether this is a physical change or a chemical change. explain your answer

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

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •