Week 10 1. Which of the following correctly states the law of conservation of energy? Energy cannot be created or destroyed but can be converted from one form to another. Energy can be create or destroyed, as well as being converted from one form to another. Energy is created when it is converted from one form to another. In most systems, some energy is destroyed and lost as heat.

2. When the strings of the acoustic guitar are plucked they vibrate 2. When the strings of the acoustic guitar are plucked they vibrate. These vibrations are transferred to particles in the air. What kind of energy is produced by these vibrating particles? Chemical energy Nuclear energy Electrical energy Sound energy

3. Jan turns on a lamp so she can read 3. Jan turns on a lamp so she can read. What type of energy provided by the lamp helps Jan read? Nuclear energy Electromagnetic energy Chemical energy Thermal energy

4. What form of energy is frequently produced as a result of friction? Electromagnetic energy Chemical energy Potential energy Thermal energy

5. When moving air or wind strikes the blades of a windmill, it causes the blades to turn. What kind of energy is involved in the movement of the windmill blades? Mechanical energy Nuclear energy Electrical energy Electromagnetic energy

6. What type of energy is released if the forces that hold the protons and neutrons of an atom in place are overcome? Electrical energy Nuclear energy Electromagnetic energy Thermal energy

7. Many household devices use batteries as an energy source 7. Many household devices use batteries as an energy source. What kind of energy is stored in a battery? Chemical energy Electrical energy Thermal energy Nuclear energy

8. An apple is hanging from a tree branch 8. An apple is hanging from a tree branch. A gust of wind blows the tree, and the apple falls. Which of the following describes the apple’s energy just as the apple hits the ground? Its potential energy due to position is zero. Its kinetic energy due to position is zero. Its potential energy is half its kinetic energy. Its kinetic energy is equal to its potential energy.

9. As a ball rolls down a hill, it has less potential energy than it did at the top of the hill. Some of the ball’s potential energy Disappears Decreases friction. Creates even more energy. Changes to kinetic energy.

10. Which of the following changes chemical energy into mechanical energy? Blender Flashlight Ceiling fan Human body