Fill in the letter of the best choice. ssment BC 6.P Bach vehicle below is traveling at the speed. Which has the most kinello enoriy? A em (11) bike (C) bird truck Which is true about a flying bird? (1) The bird has only kinetic energy. (C) The bird has only potential energy. (H) The bird has both kinetic and potential energy The bird has neither kinctie nor potential enorgy Which statement about the law of conservation of energy is true? A Energy can be destroyed, but not created. B Energy is neither created nor destroyed. C The total energy changes over time. D New energy can be created.

* **1. D - Truck** Kinetic energy depends on both mass and velocity. Since all vehicles are traveling at the same speed, the one with the most mass will have the most kinetic energy. A truck has significantly more mass than a bike, car, or bird.<br /><br />* **2. H - The bird has both kinetic and potential energy.** A flying bird has kinetic energy due to its motion (it's flying!). It also has potential energy due to its height above the ground. If it were to stop flying and fall, that potential energy would be converted into kinetic energy.<br /><br />* **3. B - Energy is neither created nor destroyed.** This is the fundamental principle of the law of conservation of energy. Energy can change forms (from potential to kinetic, for example), but the total amount of energy in a closed system remains constant.<br />