thinking critically


16. much discussion has focused on the need to drive more efficent cars and use less electricity.if the law of conservation of energy is true. why are people concerned about energy usage?

problem is that original energy that in this case is gasoline is mechanical energy and is wasteful
to make gasoline useful again is very hard and long process with nature 

17. if heat flows in only one direction, how can both hot and cold liquids reach room temperature as they sit on a table?

heat from the hot object goes to the air and the air goes to the cold liquid

18. think about what happens to jack and jill in the nursery room. what kinds of enrgy are used? how was each energy form used?

if they are walking or running they are using kinetic eergy but if they are staying in one place like siting down they are using potential energy

19. compare the 3 temperature scales you learned about. how are they different? how are they similar?
everyone know they exist and use them but the difference is that they are applied to different studys or lenguaje
20. use what you know about the movement of thermal energy to explain why you would place a minor burn on your arm under cool, running water.

because heat is transfer from the warmer object to the cooler object.
DEVELOPING SKILLS

now when you are standing up on the tramp you have potential energy due to standing at a higher level  above ground.
when you are jumping on thr tramp you have both kinetic and potential energy. potential for the springs (as energy that is stored) and height.kinetic energy whwn you are moving in the air up and down.
so when you are in your highest point in the jump you have the most potential energy.