What trends do you notice from the bar graphs? (The total is always kinetic energy plus potential energy.) The law of conservation of energy states that energy cannot be created or destroyed but can be transformed into another form. How can this be used to describe the skater’s energies as he moves up and down the track? Make sure you describe the relationship between K. E. and G. P.E.

Have you noticed that the skater does not slow down or stop? Why do you think this is?

What effect do you think adding friction to the track will have on the energies involved?

Will the result still follow the law of conservation of energy?

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

What kind of crystalline solid is graphite? o a. molecular solid b. metallic solid o c. network solid d. ionic solid

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field